Question

A magnetic needle of a compass placed close to an electric circuit deflects when the current is switched on. Give reason.​

Answer 1

The given circuit does not have any current source. In the absence of current, the wire does not behave as a magnet and hence, the compass needle will not show any deflection.

Answer 2

because the wire carrying current acts as a temporary magnet, so magnetic field is produced around the circuit due to which the compass needle shows deflection.