Electromagnetic Induction

Q. When a current carrying coil has a continuously varying current, and is placed close to another loop of wire, current will be induced in the wire.

1. True
2. False

Q. When a magnet is brought close to a wire, the magnetic field around the wire ___.

1. Changes
2. Remains constant
3. Goes to infinite
4. Becomes zero

Q. An electric current is induced in a circuit when:

1. A magnet is brought close to a wire
2. A magnet is kept close to a wire
3. A magnet is taken away from a wire
4. A magnet is kept far from a wire

Q.

A bar magnet falls along the axis of a circular current carrying loop. The direction of current (i) is as indicated. What can be said about the acceleration of the bar magnet when it comes near the coil?

1. a < g

2. a = 0

3. a = g

4. a > g

Q.

“When a magnet is brought close to the loop, the induced current in the loop will be in a direction such that the part of the loop facing the magnet repels the magnet.”
Using the above statement, choose the correct answers.

1. When the north pole of the magnet is brought close to the loop, the current will be anticlockwise
2. When the south pole of the magnet is brought close to the loop, the current will be clockwise
3. When the south pole of the magnet is brought close to the loop, the current will be anticlockwise
4. When the north pole of the magnet is brought close to the loop, the current will be clockwise

Q.

In the given figure, the galvanometer will not have a deflection if:​

1. the bar magnet is moved in the direction shown

2. the bar magnet is moved in the opposite direction

3. the bar magnet is kept stationary

4. the wire loop on the conducting cylinder is moved towards the bar magnet

Q.

Electromagnetic induction refers to the:

1. charging of a body with a positive charge

2. production of current by relative motion between a magnet and a coil

3. rotation of the coil of an electric motor

4. generation of magnetic field due to a current carrying solenoid

Q.

The phenomenon of electromagnetic induction is:

1. the process of charging a body

2. production of induced current in a coil due to relative motion between a magnet and the coil

3. the process of rotating a coil of an electric motor

4. the process of generating magnetic field due to a current passing through a coil

Q.

A free charged particle moves through a magnetic field. The particle is likely to undergo a change in :

1. Speed

2. Energy

3. Direction of motion

4. None of these

Q.

Why does a compass needle get deflected when brought near a bar magnet ?