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Electromagnetic induction

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

Inductance and capacitance
Inductance only
Resistance only
Capacitance only

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Electromagnetic induction
The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be

12 mH
48 mH
24 mH
3 mH

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

Actual power of the circuit is zero
Any capacitance even if present in the circuit will not be charged
Relative power is zero
Apparent power is zero

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

Iron core
Powdered iron core
Air core
Laminated iron core

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Electromagnetic induction
Which of the following circuit elements will oppose the change in circuit current?

Resistance
Inductance
Capacitance
All of the listed here

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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

16 A/s
4 A/s
12 A/s
20 A/s

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