question_answer

How will the magnetic field produced at a point due to a current-carrying circular coil change if we (a) increase the current flowing through the coil? (b) reverse the direction of current through the coil? (c) increase the number of turns in the coil?  

Answer:

Magnetic field (B) at the centre of the circular coil (a) increases if the current is increased as . (b) reverses on reversing the current. (c) increases if the number of turns in the coil increases as field is directly proportional to the number of turns.                                                           (1 x 3)