Question # 1

The ratio of average e.m.f in the coil tot he time rate of change of current in the same coil is called

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Mutual induction

Mutual inductance

Capacitance

Self inductance

Back emf is produced due to

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Self induction

Mutual induction

A.C

Lenz's law

Faraday's law of electromagnetic induction has been used in the construction of:

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Galvanometer

Voltmeter

Electric motor

Electric genrator

Commutator

When a conductoris moved across a magnetic field:

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Emf induced its similar to that of a battery

Emf induced gives rise to induced current

An emf is induced across its ends

All are correct

None of these

The induced current is a conductor depends upon:

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Resistance of the loop

Speed with which the conductor moves

Any of these

Both (A) and (B)

None of these

The rate change of area expressed is expressed in:

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m²s^-1

ms^-2

m²s^-2

ms^-1

None of these

When there is no relative motion between the magnet and coil, the galvanometer indicated

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No current in the circuit

An increasing current

A decreasing current

A constant current

Either B or C

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

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Current

Voltage

Power

Heat

The current produced by moving a loop of wire across a magnetic field is called

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Direct current

Magnetic current

Alternating current

Induced current

None of these

An emf is set up in a conductor when it

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Is kept in a magnetic field

Is kept in an electric field

Moves across a magnetic field

Both A and B

None of these

The magnitude of induced emf depends upon the

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

Micheal Faraday and joseph Henry belong respectively to:

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USA and England

England and France

England and USA

USA and France

None of these

For inducting emf in a coil the basic requirement is that:

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Flux should link the coil

Change in flux should link the coil

Coil should form a closed loop

Both B and C are true

The phenomenon of generation of induced emf is called

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Electrostatic induction

Magnetic induction

Electromagnetic induction

Electric induction

Both (A) and (D)

What is the coefficient of mutual inductance, when the magnetic flux changes by 2 X 10^-2Wb, and change in current is 0.01 A?

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2 H

3 H

1/2 H

Zero

The current produced by moving a loop of a wire across a magnetic field is called:

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Direct current

Magnetic current

Alternating current

Induced current

None of these

In magnet-coil experiment, emf can be produced by:

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving the coil

Relative motion of the loop and magnet

Any one of above

All above

The induced current in the loop can be Increased by

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All above

Both A and B

Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current:

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Of same magnitude in the same direction

Of different magnitude in the same direction

Of same magnitude but in opposite direction

Of different magnitude in the opposite direction

None of these

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

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Motion emf

Electrostatic emf

Induced emf

Both A and B

Both A and C

Referring to above figure, due to change in current in the coil P, the change in magnetic flux

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Is associated with coil P

Is associated with coil S

Causes and induced current in coil S

All of these

None of these

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ECAT Pre General Science Physics Chapter 15 Electromagnetic Induction Online Test MCQs With Answers

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