Two circular coils P and Q are kept close to each other, of which coil P carries a current.

Question

(i) Two circular coils P and Q are kept close to each other, of which coil P carries a current. If coil P is moved towards Q, will some current be induced in coil Q? Give reason for your answer and name the phenomenon involved.
(ii) What happens if coil P is moved away from Q?
(iii) State any two methods of inducing current in a coil.

Answer 1

(i) When coil P is moved towards Q, current will be included in coil Q. This is because on moving P the magnetic field associated with Q increases and so a current is induced. The phenomenon is electromagnetic induction.

(ii) lf P is moved away from Q, the field associated with Q will decrease and a current will be induced but in the opposite direction.
(iii) Current can be induced in a coil by (a) moving a magnet towards or away from the coil (b) moving a coil towards or away from a magnet (c) rotating a coil within a magnetic field.