Question # 1

The induced emf in a coil is proportional to:

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Magnetic flux through the coil

Rate of change of Magnetic flux through the coil

Area of the coil

Product of magnetic flux flux and area of the coil

A real transformer does not change.

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Voltage level

Current level

Power level

Frequency

Unit of self inductance is

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Weber

Tesla

Henry

Farad

Eddy current is produced when:

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A metal is light in varying magnetic field

A metal is kept in steady magnetic field

A circular coil is placed in a steady magnetic field

A current is passed through a circualr coil

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

Which one is not present in A.C. generator.

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Armature

Magnet

Slip rings

Commutator

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

If D.C. input for step up transformer, the output is

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Zero

High

Low

May be high or low

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

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Transformer

Inductor

A.C. Generator

Ammeter

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

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Decreased

Increased

Vanishes

Remain constant

Energy density in an inductor is.

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Directly proportional to magnetic field

Directly proportional to square of magnetic field

Inversely proportional to magnetic field

Inversely proportional to square of magnetic field

The north pole of a magnet is brought near a metallic ring. The direction of induced current in the ring will be:

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Antoclockwise

Clockwise

First Clockwise and then Antoclockwise

First anticlockwise and then Clockwise

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

The magnitude of back emf:

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Increases with sped of motor

Decreases with speed of motor

Remains same

None of above

In case of inductor , energy is stored in the

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Electric field

Magnetic field

Potential field

Gravitational field

Energy density of an inductor is:

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UM=1/2μ_∘/B²

Um = 2μ_∘/B

UM = 1/2B²/μ_∘

Um = 2B²/μ_∘

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

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

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