Question # 1

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Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

The emf induced by the motion of a conductor across a magnetic field is called:

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Motional emf

Rotational emf

Induced emf

All 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

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

The working principle of transformer is.

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Self induction

Faraday's law

Mutual induction

Electromagnetic induction

When the back emf is zero, its draws.

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Zero current

Minimum current

Maximum current

Steady current

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

Self inductance of a long solenoid is given by

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None of the above

Commutator was invented by:

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William bills

William Gates

William tells

William Sturgeon

The application of mutual induction is a.

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D.C. motor

Radio

Television

Transformer

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

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

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

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

The Lenz's law is also statement of:

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Law of conservation of mass

Law of conservation of charge

Law of conservation of energy

Law of conservation of momentum

For inducing emf in a coil the basic requirement is that:

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Flux should link the coil

Change in flux should link the coil

Coil should form a closed loop

Both (b) and (c) are true

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