Question # 1

The rate change of area expressed is expressed in:

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m²s^-1

ms^-2

m²s^-2

ms^-1

None of these

A coil of constant area is placed in a constant magnetic field. An include current is produced in the coil when:

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The coil is destroyed

The coil is Rotated

The coil is neither destroyed nor rotated

Both (A) and (B)

None of these

The work is stored in the inductor as

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Electric potential energy

Elastic potential energy

Magnetic energy

Absolute potential energy

An induced current can be produced by:

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Constant magnetic field

Changing magnetic field

Varying magnetic feild

Constant electric field

None of these

Which of the following is most suitable as the core of transformer

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Soft iron

Alinco

Steel

None of these

A square loop of wire is moving through a uniform magnetic field. The normal to the loop is oriented parallel to the magnetic field. The emf induced in the loop is:

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Zero

Of smaller magnitude

Of larger magnitude

Sometimes B, sometimes C

Neither of these

Lenz's law is the consequence of

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Mass

Energy conservation

Momentum conservation

Charge

Eddy current is produced when:

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A metal is kept in varying magnetic field

A metal is kept in steady magnetic field

A circular coil is placed in a steady magnetic field

A current is passed through a circular coil

In a coil current change from 2 to 4 A in .05 s. If the average induced emf is 8V then coefficient of self-inductance is:

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0.2 henry

0.1 henry

0.8 henry

0.04 henry

The motional e.m.f depends upon the

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Length of a conductor

Strength of a magnet

Speed of the conductor

All of the above

Lens's law deals with the

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Magnitude of induced current

Magnitude of induced e.m.f

Direction of induced e.m.f

Direction of induced current

An induced current can be produced by

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Constant magnetic field

Changing magnetic field

Varying electric field

Constant electric field

None of these

The current produced by moving a loop of wire across a magnetic field is called:

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Direct current

Magnetic current

Alternating current

Induced current

None of these

The current produced by moving a loop of wire across a magnetic field is called

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Direct current

Magnetic current

Alternating current

Induced current

None of these

The law of electromagnetic induction is related to:

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Coulomb

Ampere

Faraday

Lenz

None of these

The induced current in a conductor depends upon

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Resistance of the loop

Speed with which the conductor moves

Any of these

Both A and B

None of these

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Physics ECAT Pre Engineering Chapter 15 Electromagnetic Induction Online Test MCQs With Answers

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