Question

Eddy currents are produced when:

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

Answer 1

The correct option is A

a metal is kept in varying magnetic field

Eddy current:

1. Eddy currents are produced when a conductor moves through a magnetic field or when the magnetic field around a stationary conductor changes.
2. Eddy currents can thus be produced whenever the intensity or direction of a magnetic field in a conductor changes.
3. By using a laminated core, eddy currents can be reduced.
4. Eddy current is used to generate heat in an induction furnace.
5. In moving trains, eddy current can be used to generate braking force.

Therefore, Option(A) is the correct choice.