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Electromagnetic induction

Electromagnetic induction
Lenz's law is a consequence of the law of conservation of

Induced e.m.f.
Charge
Induced current
Energy

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Electromagnetic induction
A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly

120 N
90 N
30 N
60 N

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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

24 mH
28 mH
12 mH
3 mH

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

Inductance only
Capacitance only
Inductance and capacitance
Resistance only

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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

24 mH
6 mH
48 mH
12 mH

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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
Mutual inductance
Series aiding inductance

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MORE MCQ ON Electromagnetic induction

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