A coil is suspended in a uniform magnetic field, with the plane of the coil parallel to the magnetic lines of force. When a current is passed through the coil it starts oscillating and it is very difficult to stop. But if an aluminium plate is placed near to the coil, it stops. This is due to :

development of air current when the plate is placed

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induction of electrical charge on the plate

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shielding of magnetic lines of force as aluminium is a paramagnetic material

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electromagnetic induction in the aluminium plate giving rise to electromagnetic damping

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Solution

The correct option is C electromagnetic induction in the aluminium plate giving rise to electromagnetic damping
Oscillating coil produces time variable magnetic field. It cause eddy current in aluminium plate which causes anti-torque on the coil due to which it stops.

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Similar questions

Q. Question 2
The phenomenon of electromagnetic induction is
(a) the process of charging a body.
(b) the process of generating magnetic field due to a current passing through a coil.
(c) producing induced current in a coil due to relative motion between a magnet and the coil.
(d) the process of rotating a coil of an electric motor.

The phenomenon of electromagnetic induction is

(a) the process of charging a body

(b) the process of generating magnetic field due to a current passing through a coil

(d) the process of rotating a coil of an electric motor

Q. A coil of area

A

, turns

N

and carrying current

i

is placed with its face parallel to the lines of magnetic induction

B

. The work done in rotating the coil through an angle of

180^{0}

A coil of area 100 cm^2 having 500 turns carries a current of 1 m A. It is suspended in a uniform magnetic field of induction 10^-3wb/m^2. Its plane making an angle of 60° with the lines of induction. the torque acting on the coil is

Q. A coil of area

100 c m^{2}

having

500

turns carries a current of

1 m A

. It is suspended in a uniform magnetic field of induction

10^{- 3} W b / m^{2}

. It's plane makes an angle of

60^{o}

with the lines of induction. The torque acting on the coil is :

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A coil is suspended in a uniform magnetic field, with the plane of the coil parallel to the magnetic lines of force. When a current is passed through the coil it starts oscillating and it is very difficult to stop. But if an aluminium plate is placed near to the coil, it stops. This is due to :

The correct option is C electromagnetic induction in the aluminium plate giving rise to electromagnetic dampingOscillating coil produces time variable magnetic field. It cause eddy current in aluminium plate which causes anti-torque on the coil due to which it stops.

The correct option is C electromagnetic induction in the aluminium plate giving rise to electromagnetic damping
Oscillating coil produces time variable magnetic field. It cause eddy current in aluminium plate which causes anti-torque on the coil due to which it stops.