ELECTROMAGNETIC INDUCTION QUIZ

Two coils have inductances of 8 mH and 18 mH and a coefficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be

30 mH

36 mH

38 mH

48 mH

TRUE ANSWER : ?
YOUR ANSWER : ?

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

6 H

9 H

10 H

12 H

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YOUR ANSWER : ?

A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by

Change of number of turns of coil

Variation in voltage to the coil

The resistance of magnetic path

Variation in coil current

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YOUR ANSWER : ?

In case of an inductance, current is proportional to

Magnetic field

Voltage across the inductance

None of the listed here

Both of the listed here

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YOUR ANSWER : ?

The coefficient of coupling between two air core coils depends on

None of the listed here

Mutual inductance and self inductance of two coils

Self-inductance of two coils only

Mutual inductance between two coils only

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YOUR ANSWER : ?

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

15 V

10 V

12 V

25 V

TRUE ANSWER : ?
YOUR ANSWER : ?

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

4 A/s

12 A/s

20 A/s

16 A/s

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YOUR ANSWER : ?

Higher the self-inductance of a coil,

Lower the e.m.f. induced

Lesser its weber-turns

Greater the flux produced by it

Longer the delay in establishing steady current through it

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YOUR ANSWER : ?

Air-core coils are practically free from

Both Hysteresis losses & Eddy current losses

Hysteresis losses

Eddy current losses

None of the listed here

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YOUR ANSWER : ?

Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is

10 H

20 H

5 H

15 H

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YOUR ANSWER : ?

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