| (i) An increase in the number of turns of the coil |
| (ii) An increase in the input of D.C. voltage |
| (iii) The inserting of a copper core in the coil |
A) Only (i) and (ii)
B) Only (i) and (iii)
C) Only (ii) and (iii)
D) (i), (ii) and (iii)
Correct Answer: A
Solution :
Inserting a copper core cannot increase the speed of the coil as copper is not a magnetic material. It should be an iron core instead of a copper core.
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