ELECTROMAGNETIC INDUCTION ONLINE TEST

JavaScript isn't enabled in your browser, so this file can't be opened. Enable and reload.

CLASS-12, SUBJECT-PHYSICS

YOUR NAME *

NAME OF SCHOOL *

CLASS AND SECTION *

The unit of magnetic flux is

1 point

debye

henry

weber

rutherford

Clear selection

A circular wire loop of radius r is placed in a region of magnetic field B such that the plane of the loop makes an angle 9 with the direction of B. In which of the following conditions will no emf be induced in the loop:

1 point

Change in B with time

Change in r with time

B being non-uniform in space

Change in ANGLE with time

Clear selection

The induced emf produced when a magnet is inserted into a coil does not depend upon:

1 point

The number of turns in the coil

The resistance of the coil

The magnetic moment of the magnet

The speed of approach of the magnet

Clear selection

Which one of the following can produce maximum induced emf?

1 point

50 ampere dc

50 ampere 50 Hz ac

50 ampere 500 Hz ac

100 ampere dc

Clear selection

Lenz’s law is a consequence of the law of conservation of:

1 point

Charge

Mass

Momentum

Energy

Clear selection

Two identical circular loops of metal wire are lying on a table without touching each other. Loop-A carries a current which increases with time. In response, the loop-B:

1 point

Remains stationary

Is attracted by the loop-A

Is repelled by the loop-A

Rotates about its CM, with CM fixed

Clear selection

A magnet is allowed to fall through a metal ring. During the fall

1 point

Its acceleration is equal to 'g'

Its acceleration is greater than 'g'

Its acceleration is lesser than 'g'

Its acceleration is equal to the product of 'g' and the radius of the ring

Clear selection

A coil having 500 square loops each of side 10 cm is placed normal to a magnetic field which increases at a rate of lT/s. The induced emf in volt is:

1 point

0.1

0.5

Clear selection

A metal rod moves at a constant velocity in a direction perpendicular to its length.A constant, uniform magnetic field exists in space in a direction perpendicular to the rod as well as its velocity. Select the correct statement from the following:

1 point

The entire rod is at the same potential

There is an electric field in the rod

The electric potential is highest at the centre of the rod and decreases towards

The electric potential is lowest at the centre of the rod and increases towards its ends

Clear selection

The unit of inductance is:

1 point

volt/ampere

volt x ampere

joule/ampere

volt x sec/ampere

Clear selection

What is the self-inductance of a coil which produces 5 V when the current changes from 3 A to 2 A in one millisecond?

1 point

5000H

5 mH

50H

Clear selection

When the number of turns and the length of the solenoid are doubled keeping the area of cross-section same, the inductance:

1 point

Remains the same

Is halved

Is doubled

Becomes one-fourth

Clear selection

Energy in a current-carrying coil is stored in the form of

1 point

Magnetic field

Electric field

Dielectric strength

Heat

Clear selection

Eddy currents are produced when:

1 point

A metal is kept in varying magnetic field

A metal is kept in a steady magnetic field

A circular coil is placed in a magnetic field

Through a circular coil current is passed

Clear selection

The law of electromagnetic induction has been used in the construction of:

1 point

Galvanometer

Voltmeter

Electrometer

Dynamo

Clear selection

A coil of inductance 8.4 mH and resistance 6 ohm is connected to a 12 V battery. The current in the coil is 1.0 A at approximately the time:

1 point

500s

20s

35ms

1ms

Clear selection

A transformer is used

1 point

To transform electric energy into mechanical energy

To obtain suitable dc voltage

To obtain suitable ac voltage

To transform ac into dc

Clear selection

When the current through a solenoid increases at a constant rate, the induced current

1 point

Is a constant and in the direction of inducing current

Is a constant and is opposite to the direction of inducing current

Increases with time and is in the direction of inducing current

Increases with time and is opposite to the direction of inducing current

Clear selection

Two identical coaxial circular loops carry a current / each, circulating in the same direction. If the loops approach each other, will you observe that:

1 point

The current in each increases

The current in each decreases

The current in each remains the same

The current in one increases whereas that in the other decreases

Clear selection

According to Faraday’s law, the total charge induced in a conductor that is moved in a magnetic field depends upon:

1 point

initial magnetic flux

final magnetic flux

rate of change of magnetic flux

change in magnetic flux

Clear selection

Submit

Clear form

Never submit passwords through Google Forms.

This content is neither created nor endorsed by Google. Report Abuse - Terms of Service - Privacy Policy

Forms