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• CBSE×
• Class 12 Science×
• Physics×
• Electromagnetic Induction×
• Inductance×

# Inductance Free Doubts and Solutions

## Self inductance  L1

Asked by alanpeter9611 1st March 2019, 12:47 AM

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## A circular loop of radius 10 cm,500 turns and resistance 2 ohm is placed with its plane perpendicular  to the horizontal component of the earth's magnetic field .It is rotated about its vertical diameter through 180 in 0.25 s. Estimate the magnitude of the emf and current induced in the coil.Horizontal  component of earth's magnetic  field at the place is 3*10^-5 T.

Asked by Balbir 26th July 2017, 9:18 PM

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## A square loop of side 12 cm with its side parallel to x and y axis move with velocity of 8 cms^-1in  the positive x direction in an environment containing a magnetic field in this positive z direction.The  field is neither uniform in space nor constant in time.It has a grdient of 10^-3 Tcm^-1 along the negative x direction (i.e., it increases by 10^-3 Tcm^-1 along the negative x direction i.e.it increases  by 10^-3 Tper cm as one moves in the -ve x direction),and it is decreasing in time at the rate 10^-3 Ts^-1.Determine the direction and magnitude of the induced current in the loop if its resistance is 4.5 m ohm.

Asked by Balbir 26th July 2017, 9:03 PM

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## if the no. of turns of a solonoid is doubled keeping the other factor constant how does theself inductance of a solonoid change  give some examples also

Asked by saggugurupal 20th September 2016, 3:47 PM

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## find the current in a ciruit consisting of a coil and a capacitor in series if the applied voltage is 220V , 50 Hz. The induction of the coil is 0.2H, the resistance of the coil is 50 ohms and the capacitance is 10 micro farad. Also find (a) the phase difference between voltage and current. Does the current lag or lead the voltage ? (b) p.d across each of elements.

Asked by rutujasarangmehta 15th March 2016, 9:00 AM

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## a 100 micro farad capacitor in series with a 40 ohms resistance is connected to a 110V , 60 Hz supply (a) what is the maximum current in the circuit (b) what is the time lag between the current maximum and voltage  maximum.

Asked by rutujasarangmehta 15th March 2016, 8:55 AM

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## A coil of inductance 0.5H and resistance 100 ohms is connected to a 240V , 50 Hz A.C supply (a) what is the maximum current in the coil ? (b) what is the time lag between the voltage maximum and current maximum.

Asked by rutujasarangmehta 15th March 2016, 8:49 AM

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## A aeroplane is flying at a speed of 360kmph in a horizontal direction. A verticle field strength of earth's magnetic field is 2 x 10 raise to -5 T . if the distance between the tips of its wings is 10m, calculate the emf induced between the tips of the wings.

Asked by rutujasarangmehta 15th March 2016, 8:44 AM

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## A coil of wire of 6000 turns and mean area 0.5 cm sq. is rotated with a uniform speed of 3000rpm in a space where there is a magnetic flux of 1 x 10 raise to -4 T, the axis of rotationbeing perpendicular to the field. calculate (a) maximum value of emf induced (b) av. Value of emf (c) rms value of emf (d) emf in the coil at an instant t=0.021s.

Asked by rutujasarangmehta 15th March 2016, 8:33 AM

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## an air core solenoid with length 30 cm, area of cross-section 25cm sq and number of turns 500 carries a curent of 2.5A , the current is suddenly switched off in a brief time 10 raise to -3 secs . How much is the average back emf induced across the open switch in the circuit ?

Asked by rutujasarangmehta 15th March 2016, 8:25 AM

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## Obtain the expression for the mutual inductance between a long straight wire and a square loop of side a lie in the same plane X - O- Y.

Asked by vinitapahel123 1st December 2015, 3:56 PM

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## (a)  Define self-inductance of a coil. Obtain an expression for the energy stored in a solenoid of self-inductance ‘L’ when the current though it grows from zero to ‘I’. (b)  A square loop MNOP of side 20 cm is placed horizontally in a uniform magnetic field acting vertically downwards as shown in the figure. The loop is pulled with a constant velocity of 20 cm s−1 till it goes out of the field. (i) Depict the direction of the induced current in the loop as it goes out of the field. For how long would the current in the loop persist? (ii) Plot a graph showing the variation of magnetic flux and induced emf as a function of time.

Asked by Topperlearning User 10th July 2015, 9:57 AM

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## How is the mutual inductance of a pair of coils affected when: (i) Separation between the coils is increased? (ii) The number of turns of each coil is increased? (iii) A thin iron sheet is placed between the two coils, other factors remaining the same? Explain your answer in each case.

Asked by Topperlearning User 7th July 2015, 2:32 PM

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## A plot of magnetic flux(f)versus current(I) is shown in the figure for two inductors A and B. Which of the two has larger value of self inductance?

Asked by Topperlearning User 7th July 2015, 2:31 PM

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## How does the self-inductance of an air coil change, when (i) the number of turns in the coil is decreased (ii) an iron rod is introduced in the coil.

Asked by Topperlearning User 7th July 2015, 2:20 PM

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## Name the phenomenon associated with the production of back emf in a coil due to change of electric current through the coil itself. Name and define the SI unit used for measuring this characteristic of the coil .

Asked by Topperlearning User 7th July 2015, 2:11 PM

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## Derive the formula for the self inductance of a long solenoid.

Asked by Topperlearning User 7th July 2015, 1:43 PM

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## Calculate the mutual inductance of a 1 m long coil with 0.4 m radius and 1000 turns has a secondary of 500 turns wound near its mid-point.

Asked by Topperlearning User 7th July 2015, 1:38 PM

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## Can a wire act as an inductor? Give reason.

Asked by Topperlearning User 7th July 2015, 12:58 PM

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## Calculate total inductance.

Asked by Topperlearning User 7th July 2015, 12:56 PM

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## What is the difference between self inductance and mutual inductance?

Asked by Topperlearning User 7th July 2015, 11:36 AM

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## Suppose a circular coil and a conductor are kept adjacent to each other in same plane. Calculate the mutual inductance if the radius of circular coil is 'r' with 'n' number of turns kept at distance 'l' from the conductor.

Asked by Topperlearning User 7th July 2015, 11:36 AM

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## Suppose the two coils with inductance L are connected as shown in the diagram above. Calculate the total self inductance.

Asked by Topperlearning User 7th July 2015, 11:24 AM

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## What will be the effect on self inductance when the number of coils is doubled?

Asked by Topperlearning User 7th July 2015, 11:18 AM

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## The primary coil of an ideal step up transformer has 100 turns and transformation ration is also 100. The input voltage and power are 220 V and 1100 W respectively. Calculate (a) the number of turns in the secondary coil. (b) the current in the primary coil. (c) the voltage across the secondary coil. (d) the current in the secondary coil. (e) the power in the secondary coil.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## How does the mutual inductance of a pair of coils change when (i) the distance between the coils is increased and(ii) the number of turns in each coil is decreased ? Justify your answer in each case.

Asked by Topperlearning User 4th June 2014, 1:23 PM

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## What is coefficient of coupling  given L1 = 4 H , L2 = 4 H , M = 256.

Asked by Topperlearning User 4th June 2014, 1:23 PM