The best material for the core of the primary and secondary coils of an induction coil is
-
A.
copper, because it has a good conductor of electricity -
B.
steel, because it becomes magnetic and retains its magnetism for a long time -
C.
rubber, because it is a good insulator and the user is prevented from shock -
D.
soft iron, because it becomes magnetic but easily loses its magnetism -
E.
glass, because it is transparent