Question # 1

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

Michael Faraday and Joseph Henry belongs to

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England and USA

France and USA

China and USA

None of these

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

Induced emf in A.C. generator can be increased by

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Decreasing area of coil

Decreasing magnetic field

Increasing area of coil

Slowing down speed of coil

In self induction A coil is connected in__________ with battery and a rheostat.

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Parallel

Series

Both A and B

None of above

The Si unit of Mutual inductance is:

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VA^-1S^-1

VAS^-1

VSA^-1

ASV^-1

Mutual induction has a practical role in the performance of the.

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Radio choke

Transformers

A.C. Generator

D.C. Generator

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

If force in the direction of velocity of conductor, then induced current is directed,

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Anti clockwise

Clock wise

At equilibrium

None of above

Energy density in an inductor is.

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Directly proportional to magnetic field

Directly proportional to square of magnetic field

Inversely proportional to magnetic field

Inversely proportional to square of magnetic field

Mutual induction play role in.

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Generator

D.C. motor

Galvanometer

Transformer

The negative sign with induced emf in Faraday's law is in accordance with

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Lenz's law

Amperes law

Boyle's law

Gauss law

If the coil is wound on iron core, the flux through it.

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Decreases

Becomes zero

Increases

Remains constant

Electromagnetic induction obeys law of conservation

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Charge

Energy

Momentum

Mass

The movement of conductor in magnetic field produces electrical current was discovered in:

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1931

1731

1842

1831

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