ELECTROMAGNETIC INDUCTION QUIZ

Which of the following is unit of inductance?

Ohm

Weber/metre

Ampere turns

Hennry

TRUE ANSWER : ?
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Lenz's law is a consequence of the law of conservation of

Energy

Induced current

Charge

Induced e.m.f.

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Which circuit element(s) will oppose the change in circuit current?

Inductance and capacitance

Resistance only

Inductance only

Capacitance only

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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

12 H

10 H

9 H

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A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage?

0.5 s

0.1 s

None of the listed here

0.2 s

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The polarity of the induced voltage can be determined by using the left-hand generator rule.

Yes

No

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Which of the fpllowing inductor will have the least eddy current losses ?

Laminated iron core

Powdered iron core

Iron core

Air core

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Which of the following circuit element stores energy in the electromagnetic field?

Resistance

Variable resistor

Inductance

Condenser

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Air-core coils are practically free from

Both Hysteresis losses & Eddy current losses

None of the listed here

Hysteresis losses

Eddy current losses

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The coefficient of coupling between two air core coils depends on

Mutual inductance and self inductance of two coils

Self-inductance of two coils only

None of the listed here

Mutual inductance between two coils only

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