question_answer

  How does the strength of the Magnetic field at the centre of a circular coil of a wire depend on: (a) radius of the coil (b) number of turns in the coil.

Answer:

                  (i) North pole to South Pole. (ii) The strength of magnetic field is higher in this region. (iii) A.C. voltage can be stepped up and transmitted over long distances without much loss of energy.