Question # 1

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

The Si unit of Mutual inductance is:

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VA^-1S^-1

VAS^-1

VSA^-1

ASV^-1

The motional emf developed in a conduction depends upon.

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Length

Orientation

Magnetic field

All of the above

When a motor is over loaded then the magnitude of back emf.

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Increases

Decreases

Remain constant

Zero

Self inductance of a long solenoid is given by

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None of the above

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

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

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

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' s1ast rule

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

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Michael Faraday and Joseph Henry belongs to

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England and USA

France and USA

China and USA

None of these

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

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 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

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

When the back emf is zero, its draws.

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Zero current

Minimum current

Maximum current

Steady current

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