H C VERMA Solutions for Class 12-science Physics Chapter 11 - Thermal and Chemical Effect of Electric Current

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Chapter 11 - Thermal and Chemical Effect of Electric Current Exercise 218

Question 1

An electric current of 2.0A passes through a wire of resistance 25 H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current. How much heat will be developed in minute?

Solution 1

Heat= H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

 H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

 H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Question 2

A coil of resistance 100H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current is connected across a battery of emf 6.0V. Assume that the heat developed in the coil is used to raise its temperature. If the heat capacity of the coil is 4.0 J/K, how long will it take to raise the temperature of the coil by 15H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current?

Solution 2

Heat produced by coil=heat to increase temperature of coil

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentmin

Question 3

The specification on a heater coil is 250V, 500W. Calculate the resistance of the coil. What will be the resistance of the coil of 1000W to operate at the same voltage?

Solution 3

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Now, P=1000W

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Chapter 11 - Thermal and Chemical Effect of Electric Current Exercise 219

Question 4

A heater-coil is to be constructed with a nichrome wire (H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current) which can operate at 500W when connected to a 250V supply. (a) What would be the resistance of the coil? (b) If the cross-sectional area of the wire isH-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current, what length of the wire will be needed? (c) If the radius of each turn is 4.0mm, how many turns will be there in the coil?

Solution 4

(a) H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

(b) H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentm

(c) Number of turns=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Question 5

A bulb with rating 250V, 100W is connected to a power supply of 220V situated 10m away using a copper wire of area pf cross-sectionH-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current. How much power will be consumed by the connecting wires? Resistivity of copper=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current.

Solution 5

Resistance of the bulb

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Resistance of copper wire

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Total resistance of copper wire(both side connecting wire) = H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

The effective resistance

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

The current supplied by the power station

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Power supplied/consumed by both side connecting wire

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentmW

Question 6

An electric bulb, when connected across a power supply of 220V, consumes a power of 60W. If the supply drops to 180V, what will be the power consumed? If the power supply is suddenly increased to 240V, what will be the power consumed?

Solution 6

Power=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

(a) H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

 H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentW

(b) H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

 H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentW

Question 7

A servo voltage stabilizer restricts the voltage output to 220VH-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current. If an electric bulb rated at 220V, 100W is connected to it, what will be the minimum and maximum power consumed by it?

Solution 7

Resistance of the bulb

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

For minimum power, voltage should be minimum

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Power, H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentW

For maximum power, voltage should be maximum

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentW

Question 8

An electric bulb marked 220V, 100W will get fused if it is made to consume 150W or more. What voltage fluctuation will the bulb withstand?

Solution 8

Resistance of the bulb

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Let maximum voltage bulb can withstand

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentvolt

Question 9

An immersion heater rated 1000W, 220V is used to heat 0.01H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current of water. Assuming that the power is supplied at 220V and 60% of the power supplied is used to heat the water, how long will it take to increase the temperature of the water from 15H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current to 40H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current?

Solution 9

Power supplied by the heater=1000W

Power consumed by water=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentW

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentminutes

Question 10

An electric kettle used to prepare tea, takes 2 minutes to boil 4 cups of water (1 cup contains 200 cc of water) is the room temperature is 25H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current. (a) If the cost of power consumption is Rs 1.00 per unit (1 unit=1000 watt-hour), calculate the cost of boiling 4 cups of water. (b) What will be the corresponding cost if the room temperature drops to 5H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current?

Solution 10

(a) volume of water boiled=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentcc

Mass of water boiled=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentKg

Heat required for boiling water

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentJ

We know

1000 watt-hour=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentcost of boiling 4 cups of water=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

 (b) If room temperature drops to H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Heat required, H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentJ

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentcost of boiling 4 cups of water=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Question 11

The coil of an electric bulb takes 40 watts to start glowing. If more than 40W is supplied, 60% of the extra power is converted into light and the remaining into heat. The bulb consumes 100W at 220V. Find the percentage drop in the light intensity at a point if the supply voltage changes from 220V to 200V.

Solution 11

Resistance of the bulb, H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Case 1: When 220V supply is used.

Excess power=100-40=60W

Power converted into light=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentW

Case 2: When 200V supply is used.

Power consumed by bulb=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentW

Excess power=82.64-40=42.64W

Power converted into light=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentW

Now, percentage drop in intensity of light=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Question 12

The 2.0H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current resistor shown in figure is dipped into a calorimeter containing water. The heat capacity of the calorimeter together with water is 2000J/K. (a) If the circuit is active for 15 minutes, what would be the rise in the temperature of the water? (b) Suppose the H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current resistor gets burnt. What would be the rise in the temperature of the water in the next 15 minutes?

 

 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Solution 12

Equivalent resistance of the circuit

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Current through battery

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentA

6H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current and 2H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current resistance are in parallel combination so current will be distributed in inverse ratio of resistance i.e., in ratio of 1:3.

Current in 2H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current resistance=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentA

(a) Heat generated by 2H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current resistance= heat taken by water and calorimeter

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

(b) Equivalent resistance of the circuit

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Current in 2H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current resistance

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

I=2A

Heat generated by 2H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current resistance=heat taken by water and calorimeter

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

 H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Question 13

The temperatures of the junctions of a bismuth-silver thermocouple are maintained at 0H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current and 0.001H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current. Find the thermo-emf (Seebeck emf) developed. For Bismuth-silver, H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentV/deg andH-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current.

Solution 13

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Emf; H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentV

Question 14

Find the thermo-emf developed in a copper-silver thermocouple when the junctions are kept at 0H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current and 40H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current. Use the data in table (33.1).

Solution 14

Difference in temperature H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current ; H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Emf H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentV

Question 15

Find the neutral temperature and inversion temperature of copper-iron thermocouple if the reference junction is kept at 0H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current. Use the data in table (33.1).

Solution 15

Here,

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Thus, the neutral temperature

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

So, inversion temperatureH-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Question 16

Find the charge required to flow through an electrolyte to liberate one atom of (a) a monovalent material and (b) a divalent material.

Solution 16

One equivalent mass of the substance requires 96500 coulombs.

(a) For a monovalent material

Equivalent mass=molecular mass

So, H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current atoms require 96500C

1 atom requires=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

(b) For a divalent material

Equivalent mass=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

So, H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current atoms require 96500C

1 atom requires=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Question 17

Find the amount of silver liberated at cathode if 0.500A of current is passed through AgH-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current electrolyte for 1 hour. Atomic weight of silver is H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current g/mole.

Solution 17

Since Ag is monoatomic.

Equivalent mass of silver=molecular mass

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentgm

The ECE of silver

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Using,

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentgm

Question 18

An electroplating unit plates 3.0g of silver on a brass plate in 3.0 minutes. Find the current used by the unit. The electrochemical equivalent of silver isH-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current.

Solution 18

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentA

Question 19

Find the time required to liberate 1.0 liter of hydrogen at STP in an electrolytic cell by a current of 5.0A.

Solution 19

Mass of 1 liter hydrogen, H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentgm

Now,

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentMinutes.

Question 20

Two voltameters, one having a solution of silver salt and the other of a trivalent-metal salt, are connected in series and a current of 2A is maintained for 1.50 hours. It is found that 1.00g of the trivalent-metal is deposited. (a) What is the atomic weight of the trivalent metal? (b) How much silver is deposited during this period? Atomic weight of silver is 107.9 g/mole.

Solution 20

(a) For the trivalent metal salt

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Now, H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Atomic weight=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

(b) H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentgm

Question 21

A brass plate having surface area H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current on one side is electroplated with 0.10 mm thick silver layers on both sides using a 15A current. Find the time taken to do the job. The specific gravity of silver is 10.5 and its atomic weight is 107.9 g/mol.

Solution 21

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentA

Surface area, H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Thickness, t=0.1mm=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentcm

Volume of Ag deposited=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current for one side

For both sides, Mass of Ag=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentgm

Using, H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentminutes 

Question 22

Figure shows an electrolyte of AgCl through which a current is passed. It is observed that 2.68g of silver is deposited in 10 minutes on the cathode. Find the heat developed in the 20H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current resistor during this period. Atomic weight of silver is 107.9 g/mole.

 

 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Solution 22

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentgm

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentsec

Now, H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentA

Heat developed in the 20H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current resistor

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Question 23

The potential difference across the terminals of a battery of emf 12V and internal resistance H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current drops to 10V when it is connected to a silver voltameter. Find the silver deposited at the cathode in half an hour. Atomic weight of silver is 107.9 g/mole.

Solution 23

Terminal potential energy, TPD=10V

Emf=12V

We know that, while discharging

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentA

Using, H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentgm

Question 24

A plate of area 10H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current is to be electroplated with copper (density 9000 kg/H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current) to a thickness of 10 micrometers on both sides, using a cell of 12V. Calculate the energy spent by the cell in the process of deposition. If this energy is used to heat 100g of water, calculate the rise in the temperature of the water. ECE of copper=H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current and specific heat capacity of water=4200 J/kg-K.

Solution 24

Surface area H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Thickness H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Volume of AgH-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

Mass of Ag=densityH-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentvolume

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Currentkg

Using, H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentC

Energy spent by cell= work done by the cell

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric CurrentkJ

When this energy is used to heat 100gm of water, rise in temperature.

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current 

H-c-verma Solutions Cbse Class 12-science Physics Chapter - Thermal And Chemical Effect Of Electric Current