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Month: December 2018

A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be____________?

August 11, 2021December 16, 2018 by admin
A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be____________?

A. 10 V
B. 15 V
C. 25V
D. 50V

Categories Electromagnetic Induction

Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?

August 11, 2021December 16, 2018 by admin
Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?

A. 6 H
B. 8 H
C. 12 H
D. 24 H

Categories Electromagnetic Induction

Lenz’s law is a consequence of the law of conservation of__________?

August 11, 2021December 16, 2018 by admin
Lenz’s law is a consequence of the law of conservation of__________?

A. induced current
B. charge
C. energy
D. induced e.m.f.

Categories Electromagnetic Induction

In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be____________?

August 11, 2021December 16, 2018 by admin
In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be____________?

A. 2.0
B. 1.0
C. 0.5
D. zero

Categories Electromagnetic Induction

A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be___________?

August 11, 2021December 16, 2018 by admin
A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be___________?

A. 6 mH
B. 14 mH
C. 24 mH
D. 48 mH

Categories Electromagnetic Induction

The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is______________?

August 11, 2021December 16, 2018 by admin
The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is______________?

A. 4 mH
B. 5 mH
C. 6 mH
D. 12 mH

Categories Electromagnetic Induction

In case of an inductance, current is proportional to___________?

August 11, 2021December 16, 2018 by admin
In case of an inductance, current is proportional to___________?

A. voltage across the inductance
B. magnetic field
C. both A. and B.
D. neither (A) nor (B)

Categories Electromagnetic Induction

For a purely inductive circuit which of the following is true ?

August 11, 2021December 16, 2018 by admin
For a purely inductive circuit which of the following is true ?

A. Apparent power is zero
B. Relative power is.zero
C. Actual power of the circuit is zero
D. Any capacitance even if present in the circuit will not be charged

Categories Electromagnetic Induction

An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be______________?

August 11, 2021December 16, 2018 by admin
An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be______________?

A. 64 A/s
B. 32 A/s
C. 16 A/s
D. 4 A/s

Categories Electromagnetic Induction

Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be______________?

August 11, 2021December 16, 2018 by admin
Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be______________?

A. 32 mH
B. 38 mH
C. 40 mH
D. 48 mH

Categories Electromagnetic Induction
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