(a)[3]
The statements below explain how a relay works, but they are out of sequence. P: Current in the coil produces an electromagnet. Q: The secondary circuit is completed. R: The armature pivots, closing the contacts. S: Part C pulls the armature. T: The switch in the primary circuit is closed. Put the statements into the correct order. One statement has already been placed for you.
(b)[2]
State the name of the metal and explain why this metal is chosen for use in the electromagnet.