Question # 1

Mutual induction play role in.

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Generator

D.C. motor

Galvanometer

Transformer

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

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Radio choke

Transformers

A.C. Generator

D.C. Generator

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

Electromagnetic induction obeys law of conservation

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Charge

Energy

Momentum

Mass

The rod of unit length is moving at 30 o through a magnetic field of 1 T. If the velocity of rod is 1 m/s, then induced emf in the rod will be given by

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I V

0.25 V

0.5 V

0.6 V

What is the co-efficient of mutual inductance, when the magnetic flux changes by 2 x 10^-2 Wb, and change in current is 0.01 A?

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2 H

3 H

1/2 H

Zero

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

The device in which induced emf is statically induced emf is:

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Transforms

AC generator

Alevator

Dynamo

A.C is converted into D.C by

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Dynamo

Rectifier

Motor

Transformer

Self induction does not depend on

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Number of turns of the coil

Area of cross section of the core

Nature of material of the core

Current through inductor

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

DC generator by william Sturgeon in:

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1894

1961

1834

1961

Unit of self inductance is

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Weber

Tesla

Henry

Farad

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

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

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