Question # 1

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

A.C. Generator based upon the

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Lenz's law

Maxwell's relation

Faradays law of electromagnet induction

Mutual induction

Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

Step up transformer is used.

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Step up D.C. voltage

Step up A.C. voltage

Step up both A.C and D.C.

Step up A.C. current

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

In self induction A coil is connected in__________ with battery and a rheostat.

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Parallel

Series

Both A and B

None of above

If the coil is wound on iron core, the flux through it.

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Decreases

Becomes zero

Increases

Remains constant

If magnetic field is doubled then magnetic energy density becomes.

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Four times

Two times

Three times

Six times

The device in which induced emf is statically induced emf is:

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Transforms

AC generator

Alevator

Dynamo

If we make magnetic field stronger the value of induced current is.

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Decreased

Increased

Vanishes

Remain constant

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

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

Michael Faraday and Joseph Henry belongs to

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England and USA

France and USA

China and USA

None of these

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

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

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

The mutual inductance between two coils depends upon their

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Size

Core material

Size, core material and separation

Separation

The magnitude of motional emf is given by

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The illustration of the phenomenon of mutual induction is in the device of

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Transformer

Inductor

A.C. Generator

Ammeter

The current induced can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop bay coi of many turns

All of above

The Si unit of Mutual inductance is:

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VA^-1S^-1

VAS^-1

VSA^-1

ASV^-1

Energy density of an inductor is:

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UM=1/2μ_∘/B²

Um = 2μ_∘/B

UM = 1/2B²/μ_∘

Um = 2B²/μ_∘

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