| Assertion: When number of turns in a coil doubled, coefficient of self-inductance of the coil becomes four times. |
| Reason: Coefficient of self-inductance is proportional to the square of number of turns. |
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 :
The coefficient of self-inductance of the coil is given by \[L=\frac{{{\mu }_{0}}{{N}^{2}}A}{l}\]. where N is number of turns, l is length of the coil and A is area of coil, so\[L\propto {{N}^{2}}\].
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