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CBSE - XII Science - Physics - Current Electricity
what is electricity
Asked by shivashikhar69
9th December 2023,
2:27 PM
CBSE - XII Science - Physics - Current Electricity
what is drift velocity
Asked by deepajinder
5th May 2022,
8:33 PM
CBSE - XII Science - Physics - Current Electricity
the number of electrons striking the screen of CRT is 7.5×10^15 in 10 sec. calculate the electric current
Asked by saishankar160
10th February 2022,
9:57 PM
CBSE - XII Science - Physics - Current Electricity
A semiconductor slab of thickness t=0.5 mm with length l=30 cm carrying current I=2A placed in a magnetic field B=0.25T directed into the page, perpendicular to the flat surface of the slab carries 7*10^24 electrons per m^3. Calculate the Hall voltage across the slab. Indicate which edge (top or bottom) is at higher potential and why?
Asked by arjunsah797
26th January 2022,
2:56 PM
CBSE - XII Science - Physics - Current Electricity
drift velocity is directly proportional to
Asked by nonuhasan2
23rd November 2021,
2:18 PM
CBSE - XII Science - Physics - Current Electricity
What is resistance?
Asked by pappuchandra017
16th February 2021,
3:56 AM
CBSE - XII Science - Physics - Current Electricity
If the temperature of a conductor decreases,how does the relaxation time of electrons in the conductor change?
Asked by krunalgoti2004
10th August 2020,
12:21 PM
CBSE - XII Science - Physics - Current Electricity
explain slow electrons and fast electricity concept.. why electricy travel fast whereas the electron in it have very low velocity.
Asked by broprint18
5th June 2020,
9:45 AM
CBSE - XII Science - Physics - Current Electricity
How does a metal conduct electricity?
Asked by kumarisweta10012004
10th October 2019,
12:31 PM
CBSE - XII Science - Physics - Current Electricity
Obtain the relation between the terms drift velocity, relaxation time and electric field
Asked by Harimahi73
21st February 2019,
8:53 PM
CBSE - XII Science - Physics - Current Electricity
Current flows from a point that has higher electrical potential to a point of lower electrical potential potential ,didn't understand
Asked by Avadhut Katkar
21st August 2018,
5:03 PM
CBSE - XII Science - Physics - Current Electricity
DRIFT VELOCITY
Asked by 653376628360520
22nd July 2018,
9:12 PM
CBSE - XII Science - Physics - Current Electricity
Please help:
Asked by nitishkrnehu09
1st January 2018,
4:14 AM
CBSE - XII Science - Physics - Current Electricity
On the basis of electron drift, derive an expression for resistivity of a conductor in terms of number density of free electrons and relaxation time.
On what factors does resistivity of a conductor depend??
Asked by pksunilnair
2nd October 2017,
8:52 PM
CBSE - XII Science - Physics - Current Electricity
what is the dimension of electrical conductivity?
Asked by araima2001
24th June 2017,
10:03 AM
CBSE - XII Science - Physics - Current Electricity
Though the drift velocity in a conductor responsible for current is very small, the light in a room turns on immediately after the switch is turned on. Why and how does this happen?
Asked by sunil2791
22nd June 2017,
8:05 PM
CBSE - XII Science - Physics - Current Electricity
Prove that the total inear momentum of electrons in a conductor of length l carrying a current i is 
.
.
Asked by araima2001
13th June 2017,
7:14 PM
CBSE - XII Science - Physics - Current Electricity
In hydrogen atom, the electron makes 6.6 x 
revolution per second around the nucleus in an orbit of radius 0.5 x 
m. Its equivelent current will be nearly
1. 1 A
2. 1mA
3. 1 microampere
3. 1.6 x 
A
revolution per second around the nucleus in an orbit of radius 0.5 x m. Its equivelent current will be nearly A
Asked by rajeshtitu
17th July 2016,
9:04 PM
CBSE - XII Science - Physics - Current Electricity
plot a graph showing the variation of current density (j) versus the electric field (E) for two conductors of different materials. What information from this plot regarding the properties of the conducting material, can be obtained which can be used to select suitable materials for use in making (i) standard resistance and (ii) connecting wires in electric circuits? Electron drift speed is estimated to be of the order of mm s−1. Yet large current of the order of few amperes can be set up in the wire. Explain briefly.
Asked by Topperlearning User
8th July 2015,
3:00 PM
CBSE - XII Science - Physics - Current Electricity
Define the term ‘mobility’ of charge carriers. Write its S.I. unit
Asked by Topperlearning User
8th July 2015,
11:17 AM
CBSE - XII Science - Physics - Current Electricity
Asked by yash.bisht9910
25th May 2015,
5:49 PM
CBSE - XII Science - Physics - Current Electricity
which of the following characteristics of electrons determines the current in a conductor?
1. drift velocity alone
2. thermal velocity alone
3. both drift velocity and thermal velocity
4. neither drift nor thermal velocity
Asked by vipuljain1964
5th May 2015,
5:53 PM
CBSE - XII Science - Physics - Current Electricity
Why cant we store electricity ?
Asked by srivastavaaman1998
19th April 2015,
5:48 PM
CBSE - XII Science - Physics - Current Electricity
companies say the towers are radiation free ,should we then not install towers in houses?
Asked by Ashok Rana
6th March 2015,
9:51 PM
CBSE - XII Science - Physics - Current Electricity
Sould we establsh telephone towers in our house
Asked by Ashok Rana
3rd March 2015,
8:37 PM
CBSE - XII Science - Physics - Current Electricity
a wire of length l is stretched 4 times the original length and the area is reduced 3 times the original area.what will be the new resistivity?
Asked by pragati nargotra
30th September 2014,
5:12 PM
CBSE - XII Science - Physics - Current Electricity
Find the total momentum of electrons in a straight wire of length 1000m carrying a current of 70 amperes.ans-.4 * 10-6 Newton . second
Asked by PratibhaPandey
20th July 2014,
8:50 AM
CBSE - XII Science - Physics - Current Electricity
Write the mathematical relation between mobility and drift velocity of charge carriers in a conductor. Name of mobile charge carriers responsible for conduction of electric current in (i) an electrolyte (ii) an ionized gas.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Current Electricity
Sketch a graph showing variation of resistivity of carbon with temperature.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Current Electricity
A wire of resistance 8R is bent in the form of a circle. What is the effective resistance between the ends of a diameter AB? 1
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Current Electricity
A cylindrical metallic wire is stretched to increase its length by 5%.Calculate the percentage change in its resistance.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Current Electricity
We knows that the large numbers of free electrons are present in the metals. Why is no current established in the absence of electric field?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Current Electricity
A conductor of length l is connected to battery of potential V. If the length of the conductor is tripled by stretching it, keeping V constant, explain how the following factors vary in the conductor. (i) Drift velocity of electrons (ii) Resistivity
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Current Electricity
What will be trajectory of an electron in the absence and in the presence of an external electric field?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Current Electricity
Name the mobile charge carriers responsible for the production of electric current in (i) metals (ii) an electrolyte (iii) an ionized gas.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Current Electricity
What is mobility of electrons and how is it related with the conductivity?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Current Electricity
If the temperature of a conductor increases, how does the relaxation time of electrons in the conductor changes?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Current Electricity
What is the effect of heating on the drift velocity of electrons of a conductor?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Current Electricity
Define drift velocity of electrons for a metallic conductor.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Current Electricity
if a wire is stretched to make it 0.1% longer then by how much % does its resistance increase or decrease?
Asked by Malavika Umesh
14th May 2014,
6:06 PM
CBSE - XII Science - Physics - Current Electricity
The charge on an electron is extremely small and also the drift velocity is very small. Even then we get sufficient amount of current in a wire. Why?
Asked by Topperlearning User
21st April 2014,
4:14 PM
CBSE - XII Science - Physics - Current Electricity
Define the terms (i) drift velocity, (ii) relaxation time. A conductor of length L connected to a source of emf ε. If this conductor is replaced by another conductor of same material and same area of cross-section but of length 3L, how will the drift velocity change?
Asked by Topperlearning User
21st April 2014,
2:57 PM
CBSE - XII Science - Physics - Current Electricity
How are the electric field E and the resistance R changes when a potential difference V applied across a conductor of length L and diameter D reduces to (i) halved (ii) Length L of conductor is halved (iii) Diameter D is doubled.
Asked by Topperlearning User
21st April 2014,
2:02 PM
CBSE - XII Science - Physics - Current Electricity
Calculate the electrical conductivity of the material of a conductor of length 2 m, area of cross-section 0.02 mm2 having a resistance of
Asked by Topperlearning User
21st April 2014,
1:52 PM
CBSE - XII Science - Physics - Current Electricity
Large amount of current can be obtained from the small drift velocity and small electronic charge in a conductor. Why?
Asked by Topperlearning User
21st April 2014,
12:44 PM
