Question # 1

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

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's 1st rule

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

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0.1 J

10 J

100 J

1000 J

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

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 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

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

Electromagnetic induction obeys law of conservation

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Charge

Energy

Momentum

Mass

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 the back emf is zero, its draws.

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Zero current

Minimum current

Maximum current

Steady current

In D.C. generator, split rings act as.

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Capacitor

Commutator

Resistor

Inductor

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

When a conductor moves across a magnetic field an emf is set up this emf is called.

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Variable emf

Constant emf

Back emf

Induced emf

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

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

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

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Zero

High

Low

May be high or low

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

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