Question # 1

The change of magnetic flux through a circuit will produce

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Magnetic Field

Electric Field

emf

a.c

A device which converts Electrical energy into mechanical energy is called as

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Transformer

Generator

Motor

All of these

Referring to above figure, a changing current in coil P can be produced:

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At the instant the switch is closed

At the instant the switch is opened

With the help of rheostat

All of these

None of these

The induced current in the loop can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All above

Both (A) and (B)

Referring to above figure, current in the coil P grows from zero to its maximum value:

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

All of above

Neither of above

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

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The coil is distorted

The coil is rotated

The coil is neither distorted nor rotated

Both A and B

None of these

An emf is set up in a conductor when it:

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Is kept in a magnetic field

Is kept in an electric field

Moves across a magnetic field

Both A and B

None of these

The induced current in the loop can be Increased by

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All above

Both A and B

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

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

Split rings act as

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Vibrator

Resistor

Motor

Commulator

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 rate change of area expressed is expressed in:

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m²s^-1

ms^-2

m²s^-2

ms^-1

None of these

Faraday's law of electromagnetic induction has been used in the construction of:

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Galvanometer

Voltmeter

Electric motor

Electric genrator

Commutator

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

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The coil is distorted

The coil is rotated

The coil is neither distorted nor rotated

Both A and B

None of these

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

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2 H

3 H

1/2 H

Zero

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