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Electromagnetic induction

Electromagnetic induction
The self inductances of two coils are 8 mH and 18 mH. If the coefficient of coupling is 0.5, the mutual inductance of the coils is

6 mH
36 mH
18 mH
12 mH

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

15 H
10 H
5 H
20 H

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

Inductance only
Capacitance only
Resistance only
Inductance and capacitance

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Electromagnetic induction
The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as

Self-inductance
Capacitance
Series aiding inductance
Mutual inductance

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

Air core
Powdered iron core
Iron core
Laminated iron core

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