Consider a magnet surrounded by a wire with an on/off switch S (Fig 6.4). 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.

Question

Consider a magnet surrounded by a wire with an on/off switch S (Fig 6.4). 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.

Philoid · Accepted Answer

First understand magnetic flux whose formula is given by

where B is magnetic field and A is area also we know that induced e.m.f. or induced current can flow when there is rate of change in magnetic flux(

)

In our question we can observe that area is constant also B is constant and θ is also not changing. Hence which means current will not flow in the circuit.