Question # 1

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

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

Induced emf in A.C. generator can be increased by

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Decreasing area of coil

Decreasing magnetic field

Increasing area of coil

Slowing down speed of coil

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Lenz's law

Faraday's law

Ampere's law

None of these

Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

Energy density in an inductor is.

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Directly proportional to magnetic field

Directly proportional to square of magnetic field

Inversely proportional to magnetic field

Inversely proportional to square of magnetic field

The device in the circuit that consume electrical energy are known as.

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Dissipaters

Generator

Load

Motors

By winding the coil around a less magnetic core, self induction.

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Will increase

Will decrease

Remain same

First increase then decrease

Commutator was invented by:

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William bills

William Gates

William tells

William Sturgeon

the core of transformer is laminated so reduce.

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Magnetic loss

Hysteresis loss

Eddy current loss

Electric loss

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

What is the co-efficient of mutual inductance, when the magnetic flux changes by 2 x 10^-2 Wb, and change in current is 0.01 A?

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2 H

3 H

1/2 H

Zero

The unit of induced emf is

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Ampere

Volt

Joule/coulomb

Both (b) and (c)

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

In case of inductor , energy is stored in the

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Electric field

Magnetic field

Potential field

Gravitational field

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

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

The rod of unit length is moving at 30 o through a magnetic field of 1 T. If the velocity of rod is 1 m/s, then induced emf in the rod will be given by

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I V

0.25 V

0.5 V

0.6 V

The Lenz's law fulfils.

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Law of conservation of energy

Law of conservation of charge

Law of conservation of momentum

Kirchhoff's law

When a conductor moves across a magnetic field an emf is set up this emf is called.

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Variable emf

Constant emf

Back emf

Induced emf

In A.C. generator , when plane of coil is perpendicular to magnetic field, then output of generator is.

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NwAB

2pi f

Maximum

Zero

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

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Charge

Momentum

Energy

Angular momentum

The Si unit of Mutual inductance is:

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VA^-1S^-1

VAS^-1

VSA^-1

ASV^-1

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