Question

What are eddy currents write their two applications

Answer 1

Eddy currents (also called Foucault's currents) are loops of electrical current induced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field.

Eddy currents in conductors of non-zero resistivity generate heat as well as electromagnetic forces. The heat can be used for induction heating. The electromagnetic forces can be used for levitation, creating movement, or to give a strong braking effect.

Answer 2

Eddy currents :

(a) Observed first by Foucalt in 1895.

(b)When a mass of a metal moves in

a magnetic field or when the

magnetic field through a

stationary mass of a metal

is altered, induced current is

produced in the metal.

(c) This induced current flows in the

metal in the form of closed loops

resembling whirlpool or eddies.

(d) These are known as eddy

currents or Foucault current.

(e) Direction of eddy current is given

by Lenz's law.

Applications of eddy current :

(a) Dead beat galvanometer

(b) Induction furnace

(c) Induction motors

(d) Electro magnetic brakes

(e) Speedometer