Question

what are Eddy current? give it's two applications

Answer 1

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Eddy currents (also called Foucault currents) are loops of electrical currentinduced within conductors by a changing magnetic field in the conductor due to Faraday's law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. They can be induced within nearby stationary conductors by a time-varying magnetic field created by an AC electromagnet or transformer, for example, or by relative motion between a magnet and a nearby conductor. The magnitude of the current in a given loop is proportional to the strength of the magnetic field, the area of the loop, and the rate of change of flux, and inversely proportional to the resistivity of the material.




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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