Question # 1

The induced emf in a coil is proportional to:

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Magnetic flux through the coil

Rate of change of Magnetic flux through the coil

Area of the coil

Product of magnetic flux flux and area of the coil

Eddy current is produced when:

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A metal is light 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 circualr coil

Energy stored in an inductor is:

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1/2L²I

1/2L²/I

_1/2LI²

1/2LI

If a step up transformer were 100% efficient the primary and secondary winging's would have the same.

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Current

Power

Voltage

Direction of winding

The direction of induced current is always so as to oppose the change which causes the current is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff's 1st rule

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

The Si unit of Mutual inductance is:

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VA^-1S^-1

VAS^-1

VSA^-1

ASV^-1

The direction of induced current is always so as to oppose the change which causes the current, this is the statement of

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Lenz's law

Faraday's law

Ampere's law

Coulomb's law

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

The unit of induced emf is

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Ampere

Volt

Joule/coulomb

Both (b) and (c)

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

A.C is converted into D.C by

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Dynamo

Rectifier

Motor

Transformer

A real transformer does not change.

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Voltage level

Current level

Power level

Frequency

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

The north pole of a magnet is brought near a metallic ring. The direction of induced current in the ring will be:

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Antoclockwise

Clockwise

First Clockwise and then Antoclockwise

First anticlockwise and then Clockwise

A metal rod of 1 m is moving at a speed of 1 ms-1 in a direction making an angle 30^o with 0.5 T magnetic field . The emf produced is.

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0.25 N

2.5 N

0.25 V

2.5 V

If D.C. input for step up transformer, the output is

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Zero

High

Low

May be high or low

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