Home
Class 12
PHYSICS
Establish the fact that the relative mot...

Establish the fact that the relative motion between the coil and the magnet induces an emf in the coil of a closed circuit.

Text Solution

Verified by Experts

i. whenever the magnetic flux linked with a closed coil changes, an emf (electromotive force) is induced and hence an electric current flows in the circuit.
ii. This current is called an induced current called an induced emf. This phenomenon is known as electromagnetic induction.
iii. A bar magnet is placed close to a coil, some of the magnetic lines of forces of the bar magnet pas through the coil i.e., the magnetic flux is linked with the coil. When the bar magnet and coil approach each other, the magnetic flux linked with the coil increases.
iv. So this increases in magnetic flux induces an emf and hence a transient electric current flows in the circuit in one direciton. At the same time, when they recede away from one another, the magnetic flux linked with the coil decreases.
v. The decrease in magnetic flux again induces an emf in opposite direction and hence a electric current flows in the galvanometer when there is a relative motion between the coil and the magnet.
Promotional Banner

Similar Questions

Explore conceptually related problems

The strength of the induced emf depends on of the coil.

The current in a long solenoid of radius R and having n turns per unit length is given by i= i_0 sin omega t . A coil having N turns is wound around it near the centre. Find (a) the induced emf in the coil and (b) the mutual inductance between the solenoid and the coil.

A 100 turn closely wound circular coil of radius 10 cm carries a current of 3.2 A. a. What is the field at the centre of the coil ? b. What is the magnetic moment of this coil ? The coil is placed in a vertical plane and is free to rotate about a horizontal axis which coincides with its diameter. A unifrom magnetic field of 2 T in the horizontal direction exists such that initially the axis of the coil is in the direction of the field. The coil rotates through an angle of 90^@ under the influence of the magnetic field . c. What are the magnitudes of the torques on the coil in the initial and final position ? d. What is the angular speed acqired by the coil when it has rotated by 90^(@) ? The moment of inertia of the coil is 0.1 kg m^2

Does the change in magnetic flux induce emf or current?

Who discovered that current can be produced in a closed conductor whenever there is a relative motion between the conductor and a magnetic field ?

A phenomenon in which a varying current in one coil induces an emf in the neghbouring coil is

A closed coil having 100 turns is rotated in a uniform magnetic field B = 4.0 X 10^(-4) T about a diameter which is perpendicular to the field. The angular velocity of rotation is 300 revolutions per minute. The area of the coil is 25 cm^2 and its resistance is 4.0 Omega. Find (a) the average emf developed in the half a turn form a position where the coil is perpendicular to the magnetic field, (b) the average emf in a full turn and (c) the net charge displaced in part (a).