Solution –
(a) At the ends, the polarity is as follows:
X is for south pole.
Y is for north pole.
(b) Increasing the current flow in the coil is one technique to improve the electromagnet’s strength.
The diagram in the figure shows a coil wound around a soft iron bar XY. (a) State the polarity at the end X and Y as the switch is pressed. (b)Suggest one way of increasing the strength of electromagnet so formed.