Question # 1

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

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

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

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100 J

5 J

20 J

Zero

The motional emf is give by

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qvB

IBL

eBL

vBL

Self inductance of a long solenoid is given by

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None of the above

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

The jerks in D.C. motor are created by the use of.

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Armature

Commutators

Split rings

Source of emf

The Lenz's law is also statement of:

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Law of conservation of mass

Law of conservation of charge

Law of conservation of energy

Law of conservation of momentum

The mutual inductance of the coils depends upon.

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Stiffness of the coils

Density of coils

Material of coils

Geometry of the coils

Energy stored in an inductor is:

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1/2L²I

1/2L²/I

_1/2LI²

1/2LI

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

the core of transformer is laminated so reduce.

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Magnetic loss

Hysteresis loss

Eddy current loss

Electric loss

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

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

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

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1931

1731

1842

1831

Commutator was invented by:

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William bills

William Gates

William tells

William Sturgeon

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

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