question_answer 28)

  Consider a magnet surrounded by a wire with an on/off switch S, Fig. 4(EP).5. If the switch is thrown from the off position (open circuit) to the on position (closed circuit), will a current flow in the circuit? Explain.

Answer:

                    No. This is because no part of wire loop is moving. So there is no motional e.m.f. Further, as the magnet enclosed. Fig. 4(EP).5 is stationary, magnetic flux linked with the wire loop does not change. Hence, no current will flow in the circuit.