Question

Eddy currents are produced when

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

Hint:

Eddy currents are induced when a conductor is exposed to a changing magnetic field, which generates circular currents within the conductor.

Answer 1

The Correct Option is A

Step 1: Understand the concept of eddy currents.
Eddy currents are circular currents induced in a conductor when the magnetic field around it changes. These currents oppose the change in the magnetic flux according to Lenz's Law.
Step 2: Conclusion.
Eddy currents are produced when a metal is exposed to a varying magnetic field, causing changes in the magnetic flux through the metal. Final Answer: \[ \boxed{\text{A metal is kept in varying magnetic field.}} \]