Question # 1

The induced current is 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

The induced current in the loop can be increased by:

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Using a strong magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All of above

None of these

A.C. can be measure with the help of

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Nuclear effect

Magnetic effect

Chemical effect

Heating effect

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

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Direct current

Magnetic current

Alternating current

Induced current

None of these

When there is no relative motion between the magnet and coil, the galvanometer indicated

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No current in the circuit

An increasing current

A decreasing current

A constant current

Either B or C

Transformer is used to

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Increase alternating current

Increase d.c voltage

Increase & Decrease emf

All answers are right

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

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

Lenz's law is the consequence of

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Mass

Energy conservation

Momentum conservation

Charge

The induced emf in a coil is proportional to:

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Magnetic flux through a coil

Rate of change of magnetic flux through the coil

Area of the coil

Product of magnetic flux and area of the coil

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

The work is stored in the inductor as

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Electric potential energy

Elastic potential energy

Magnetic energy

Absolute potential energy

An emf is set up in a conductor when it:

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is kept in a magnetic field

is kept in a electric field

Move across a magnetic field

Both (A) and (B)

None of these

Motional emf is called motional:

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Electromagnetic force and is measured in newtons

Electromotive force and is measured in volt

Electromotive force and is measured in newtons

Electromagnetic force and is measured in volts

None of these

A metal road of length 1m is moving at a speed of 1 ms^-1In a direction making angle of 30º with 0.5 Y magnetic field. The emf produced in the rod is:

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0.25 N

0.25 V

2.5 V

2.5 N

25 V

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

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Soft iron

Alinco

Steel

None of these

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

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

When switch is kept closed

None of these

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

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 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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