Question # 1

Back emf is produced due to

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Self induction

Mutual induction

A.C

Lenz's law

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

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Transformer

Generator

Motor

All 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)

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

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Motion emf

Electrostatic emf

Induced emf

Both A and B

Both A and C

The direction of induced current is always so as to oppose the cause which produces it. This is

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Lenz's law

Ampere's law

Faraday's law

Coulomb's law

None of these

When a conductoris moved across a magnetic field:

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Emf induced its similar to that of a battery

Emf induced gives rise to induced current

An emf is induced across its ends

All are correct

None of these

The SI unit of magnetic induction is

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Weber

Weber/meter

Henry

Tesla

Micheal Faraday and joseph Henry belong respectively to:

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USA and England

England and France

England and USA

USA and France

None of these

Plan of a coil makes an angle of 20º with the lines of magnetic field. The angle between B and vector area of plane of coil is:

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Also 20º

70º

90º

180º

None of these

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

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Transformer

AC generator

Alternator

Dynamo

The phenomenon of generation of induced emf is called

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Electrostatic induction

Magnetic induction

Electromagnetic induction

Electric induction

Both (A) and (D)

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

The law of electromagnetic induction is related to:

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Coulomb

Ampere

Faraday

Lenz

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

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

The magnitude of induced emf depends upon the

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

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Motion emf

Electrostatic emf

Induced emf

Both A and B

Both A and C

Split rings act as

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Vibrator

Resistor

Motor

Commulator

A.C. can be measure with the help of

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Nuclear effect

Magnetic effect

Chemical effect

Heating effect

In magnet-coil experiment, emf can be produced by

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving

Relative motion of the loop and magnet

Any one of above

All above

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

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