Eddy currents are produced when [CBSE PMT 1993; AFMC 2002]
A metal is kept in the steady magnetic field
A circular coil is placed in a magnetic field
Through a circular coil, current is passed
The distance between the nearest node and antinode in a stationary wave is
[MP PET 1984; CBSE PMT 1993; AFMC 1996; RPET 2002]