ELECTROMAGNETIC INDUCTION

Assertion: Induced emf will always occur whenever there is change in magnetic flux. Reason : Current always induces whenever there is change in magnetic flux.

• A

• B

• C

• D

Which of the following statements is correct?

• (a) The induced e.rn.f is not in the direction opposing the change in magnetic flux so as to oppose the cause which produces it.

• (b) The relative motion between the coil and magnet produces change in magnetic flux.

• (c) Emf is induced only if the magnet is moved towards coil.

• (d) Emf is induced only if the coil is moved towards magnet

The polarity of induced emf is given by

• (a) Ampere's circuital law

• (b) Biot-Savart law

• (c) Lenz's law

• (d) Fleming's right hand rule

Lenz's law is a consequence of the law of conservation of

• (a) charge

• (b) mass

• (c) momentum

• (d) energy

Near a circular loop of conducting wire as shown in the figure, an electron moves along a straight line. The direction of the induced current if any in the loop is

• a)Variable

• b)clockwise

• c)anticlockwise

• d)zero

Two identical circular coils A and B are kept in a horizontal tube side by side without touching each other. If the current in coil A increases with time, in response, the coil B.

• (a) is attracted by A

• (c) is attracted

• (c) is repelled

• (d) rotates

Assertion: Faraday’s laws are consequence of conservation of energy. Reason : Self inductance of a coil depends on current flowing through the coil

• A

• B

• C

• D

Assertion : Only a change in magnetic flux will maintain an induced current in the coil. Reason : The presence of large magnetic flux through a coil maintain a current in the coil if the circuit is continuous.

• A

• B

• C

• D

.Assertion: Lenz’s law violates the principle of conservation of energy. Reason: Induced emf always opposes the change in magnetic flux responsible for its production

• A

• B

• C

• D

.Assertion : In the phenomenon of mutual induction, self-induction of each of the coils persists. Reason : Self -induction arises when strength of current in same coil changes. In mutual induction, current is changing in both the individual coils.

• A

• B

• C

• D