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The figure below shows an electromagnetic relay being used to switch an electric motor on and off. The electromagnet consists of a coil of wire wrapped around a core. The motor in figure is switched off.
a).Suggest suitable material for the core.
(b) What happens to the core when switch S is closed?
(c) Why do the contacts A and B close when the switch S is closed.
d). When the switch S is opened, what will happen to?
(i) The core
(ii) Soft iron armature.
(e) Give one other application of an electromagnet.
(f) State two ways in which an electromagnet could be made more powerful.