Question # 1

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

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No current in circuit

An increasing current

A decreasing current

Either B or C

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

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

When the conductor moved across a magnetic field:

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Emf induced is similar to that of a battery

Emf induced gives rise to induced current

An emf induced across its ends

All are correct

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

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)

Lens's law deals with the

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Magnitude of induced current

Magnitude of induced e.m.f

Direction of induced e.m.f

Direction of induced current

A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when:

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The coil is distorted

The coil is rotated

The coil is neither distorted nor rotated

Both A and B

None of these

The induced emf in a coil is proportional to:

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Magnetic flux through a coil

Rate of change of magnetic flux through the coil

Area of the coil

Product of magnetic flux and area of the coil

The rate change of area expressed is expressed in:

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m²s^-1

ms^-2

m²s^-2

ms^-1

None of these

Eddy current is produced when:

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A metal is kept 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 circular coil

Back emf is produced due to

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Self induction

Mutual induction

A.C

Lenz's law

Michael 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

An induced current can be produced by

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Constant magnetic field

Changing magnetic field

Varying electric field

Constant electric field

None of these

A coil of constant area is placed in a constant magnetic field. An include current is produced in the coil when:

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The coil is destroyed

The coil is Rotated

The coil is neither destroyed nor rotated

Both (A) and (B)

None of these

Referring to above figure, current in the coil P grows from zero to its maximum value:

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

All of above

Neither of above

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ECAT Physics Chapter 15 Electromagnetic Induction Online Test MCQs With Answers

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