Question # 1

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

The movement of conductor in magnetic field produces electrical current was discovered in:

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1931

1731

1842

1831

If 10 A current passes through 100 mH inductor, then energy stored is.

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100 J

5 J

20 J

Zero

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

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Decreases

Becomes zero

Increases

Remains constant

Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

The Lenz's law fulfils.

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Law of conservation of energy

Law of conservation of charge

Law of conservation of momentum

Kirchhoff's law

The magnitude of motional emf is given by

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The working principle of transformer is.

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Self induction

Faraday's law

Mutual induction

Electromagnetic induction

the core of transformer is laminated so reduce.

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Magnetic loss

Hysteresis loss

Eddy current loss

Electric loss

The motional emf is give by

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qvB

IBL

eBL

vBL

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 unit of induced emf is

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Ampere

Volt

Joule/coulomb

Both (b) and (c)

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

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

A.C. Generator based upon the

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Lenz's law

Maxwell's relation

Faradays law of electromagnet induction

Mutual induction

Mutual induction play role in.

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Generator

D.C. motor

Galvanometer

Transformer

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