| Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as: |
| Assertion [A]: Induced emf depends on number of turns and area of the coil. |
| Reason (R): Induced emf increases with increases in number of turns of coil. |
A) Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A]
B) Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A]
C) Assertion [A] is true but Reason (R) is false
D) Assertion [A] is false and Reason (R) is also false
Correct Answer: B
Solution :
(b) According to Faraday's law, the induced emf \[(\varepsilon )\] is given by \[\varepsilon =\frac{-d(N\phi )}{dt}=-\frac{d(NBA)}{dt}=-NA\frac{dB}{dt}.\] Thus the induced emf 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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