Magnetic Effects of Electric Current Activity 13.1 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. 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. 1. Why does a compass needle get deflected when brought near a bar magnet? The compass needle is a small magnet. When the compass needle is brought close to a bar magnet, the magnetic field lines of the compass needle interact with the magnetic field lines of bar magnet which results in needle deflection. 1. Draw magnetic field lines around a...
