Take a straight thick copper wire and place it between the points X and Y in an electric circuit, as shown in Fig. 13.1. The wire XY is kept perpendicular to the plane of paper.
Horizontally place a small compass near to this copper wire. See the position of its needle.
Pass the current through the circuit by inserting the key into the plug.
Observe the change in the position of the compass needle.
✅ Answer: On passing the current, the compass needle is deflected. It means that the electric current through the copper wire produces a magnetic effect.