Question # 1

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

Commutator was invented in

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1834

1820

1840

1835

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Lenz's law

Faraday's law

Ampere's law

None of these

The Si unit of Mutual inductance is:

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VA^-1S^-1

VAS^-1

VSA^-1

ASV^-1

If force in the direction of velocity of conductor, then induced current is directed,

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Anti clockwise

Clock wise

At equilibrium

None of above

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

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

A.C is converted into D.C by

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Dynamo

Rectifier

Motor

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

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

If a step up transformer were 100% efficient the primary and secondary winging's would have the same.

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Current

Power

Voltage

Direction of winding

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

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

The direction of induced current is always so as to oppose the change which causes the current, this is the statement of

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Lenz's law

Faraday's law

Ampere's law

Coulomb's law

In case of inductor , energy is stored in the

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Electric field

Magnetic field

Potential field

Gravitational field

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

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

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

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Physics FSC Part 2 Chapter 15 Online MCQ's Test MCQs With Answers

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