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
Correct Answer: Option D
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