Question # 1

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

1 Henry =

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VSA^-1

VS^-1A^-1

V^-1SA

VSA^-2

If speed of rotation of a generator is doubled the output voltage will be.

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Remain same

Double

Four time

One half

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

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

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

Electromagnetic induction obeys law of conservation

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Charge

Energy

Momentum

Mass

A.C. Generator based upon the

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Lenz's law

Maxwell's relation

Faradays law of electromagnet induction

Mutual induction

Unit of self inductance is

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Weber

Tesla

Henry

Farad

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

The magnitude of motional emf is given by

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Commutator was invented in

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1834

1820

1840

1835

When the back emf in a current is zero, it draws

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Zero current

Maximum current

Minimum current

Steady average current

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

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Charge

Momentum

Energy

Angular momentum

The motional emf developed in a conduction depends upon.

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Length

Orientation

Magnetic field

All of the above

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

The negative sign with induced emf in Faraday's law is in accordance with

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Lenz's law

Amperes law

Boyle's law

Gauss law

The only difference between the construction of D.C and A.C is.

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Carbon burshes

Coil

Commutator

Magnetic field

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