Question # 1

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

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

1 Henry =

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VSA^-1

VS^-1A^-1

V^-1SA

VSA^-2

Self inductance of a long solenoid is given by

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None of the above

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

A real transformer does not change.

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Voltage level

Current level

Power level

Frequency

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

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

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

The application of mutual induction is a.

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D.C. motor

Radio

Television

Transformer

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

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 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

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?

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45 V

15 V

90 V

300 V

A step up transformer is used 120 V line to provide 240 V. If primary coil has 100 turns the number of turns is secondary is.

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50

100

150

200

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

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Charge

Momentum

Energy

Angular momentum

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

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