| Assertion: Induced e.m.f. depends on number of turns in coil and area of the coil both associated with changing magnetic flux. |
| Reason: Induced e.m.f. increases with increase in number of turns of coil. |
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: B
Solution :
According to Faraday's law, the induced e.m.f. is given by \[E=\frac{-d\left( N\phi \right)}{dt}=-\frac{d\left( NBA \right)}{dt}=-NA\frac{dB}{dt}\]. Thus the induced e.m.f. depends on the rate of change of magnetic flux, number of turns of coil and area of the coil. If any of these factor increases (or decreases) then induced e.m.f. also increases (or decreases).
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