Question
Physics Question on Electromagnetic induction
Eddy currents are produced when
A
a metal is kept in varying magnetic field
B
a metal is kept in the steady magnetic field
C
a circular coil is placed in a magnetic field
D
through a circular coil current is passed
Answer
a metal is kept in varying magnetic field
Explanation
Solution
Suppose a metal plate is kept in a magnetic field. On the surface of the metal plate, we can imagine a loop, which will be associated with a magnetic flux due to the magnetic field. As the magnetic field is changing, there is change of magnetic flux through this loop and so an electric current is going to be induced in the loop, which is known as the eddy current.