question_answer

   (a) 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. (b) What happens if coil P is moved away from Q? (c) State any two methods of inducing current in a coil.

Answer:

                  (a) When coil P is moved towards Q, current will be induced 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. (b) If P is moved away from Q, the field associated with Q will decrease and a current will be induced but in the opposite direction (1) (c) Current can be induced in a coil by moving a magnet towards or away from the coil. (i) moving a coil towards or away from a magnet. (iii) rotating a coil within a magnetic field.   (1)