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Eddy currents are used in...

Eddy currents are used in

A

Induction furnace

B

Electromagnetic brakes

C

Speedometers

D

All of these

Text Solution

Verified by Experts

The correct Answer is:
D
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Similar Questions

Explore conceptually related problems

Name any two applications where eddy currents are used to advantage.

Renowned physicist Foucault (1819 - 1868) discovered that induced currents are produced in bulk pieces of conductors on subjecting them to changing magnetic flux. Flow pattern of these induced currents resemble swirling eddies in water and due to this reason these induced currents are called 'eddy currents'. If a freely suspended metal plate is allowed to swing like a simple pendulum between the pole pieces of a strong magnet, it is found that the motion is damped on account of setting up of eddy currents in the metal plate. Eddy currents are undesirable since they cause dissipation of electrical energy in the form of heat. Coils of transformers, electrical motors and other such devices are wound on a metallic core and in such devices a large amount of electrical energy is wasted during their operation due to eddy curents. However, eddy currents are used to advantage in certain applications like magnetic braking in trains, moving coil galvanometers, induction furnace, a.c. induction motors, electric power meters, inducto thermy devices etc. (a) What are eddy currents ? (b) Why are they termed so? (c) Briefly explain the mechanism of eddy currents. (d) What is electromagnetic damping ? (e) How is electromagnetic damping utilised in a moving coil galvanometer ?

Knowledge Check

  • Eddy currents are also known as ___________ currents.

    A
    alternating
    B
    focault
    C
    direct
    D
    peak

  • Eddy currents are produced, when

    A
    a metal is kept in a varying magnetic field.
    B
    a metal is kept in a steady magnetic field.
    C
    a circular coil is placed in a magnetic field.
    D
    current is passed through a circular coil.

  • Eddy currents are produced in:

    A
    induction furnace
    B
    electromagnetic brakes
    C
    speedometer
    D
    all of these.

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