Question

What are eddy currents write it's 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. ... This effect is employed in eddy current brakes which are used to stop rotating power tools quickly when they are turned off.Following are some of the few application of Eddy currents:

1. Electromagnetic braking

2. Repulsive effects and levitation

3. Identification of metals

4. Vibration and position sensing

5. Structural testing

6. Skin effects

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