Question # 1

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

In A.C. generator , when plane of coil is perpendicular to magnetic field, then output of generator is.

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NwAB

2pi f

Maximum

Zero

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 device in which induced emf is statically induced emf is:

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Transforms

AC generator

Alevator

Dynamo

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

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

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Decreases

Becomes zero

Increases

Remains constant

The motional emf is give by

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qvB

IBL

eBL

vBL

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

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

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

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All of above

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

Mutual induction play role in.

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Generator

D.C. motor

Galvanometer

Transformer

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

When motor is just started, back emf is almost.

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Maximum

Zero

Minimum

Infinite

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

Michael Faraday and Joseph Henry belongs to

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England and USA

France and USA

China and USA

None of these

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