| Assertion: A transformer cannot work on D.C. supply. |
| Reason: D.C. changes neither in magnitude nor in direction. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
Transformer works on the principle of mutual induction i.e. if two coils are inductively coupled and when current or magnitude flux is changed through one of the two coils, then induced e.m.f. is produced in the other coil. So whenever there is change in current or magnetic flux, only then e.m.f. is induced. But in case of D.C. Current or voltage e.m.f. is not induced because it remain constant throughout and never changes its direction and magnitude. Therefore, transformer cannot work when D.C. is applied.
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