Question # 1

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

A current generator device converts:

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Mechanical energy into chemical energy

Chemical energy into electrical energy

Mechanical energy into electrical energy

Both b and c

Lenz's law is a consequence of the law of conservation of

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Charge

Momentum

Energy

Angular momentum

The mutual inductance of the coils depends upon.

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Stiffness of the coils

Density of coils

Material of coils

Geometry of the coils

Energy stored in an inductor is:

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1/2L²I

1/2L²/I

_1/2LI²

1/2LI

A.C is converted into D.C by

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Dynamo

Rectifier

Motor

Transformer

The magnitude of back emf:

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Increases with sped of motor

Decreases with speed of motor

Remains same

None of above

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

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0.1 J

10 J

100 J

1000 J

Self induction does not depend on

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Number of turns of the coil

Area of cross section of the core

Nature of material of the core

Current through inductor

When a coil is moved in a uniform magnetic field, an induced emf is produced due of change in

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Flux density

Electric flux

Magnetic flux

Magnetic field strength

Mutual induction has a practical role in the performance of the.

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Radio choke

Transformers

A.C. Generator

D.C. Generator

If the north pole of a magnet moves away from a metallic ring

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Clockwise

Anticlockwise

First clockwise and then anticlockwise

None of above

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All of above

Self inductance of a long solenoid is given by

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None of the above

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

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

The magnitude of motional emf is given by

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Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

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Physics ICS Part 2 Chapter 15 Online MCQ's Test MCQs With Answers

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