| Assertion: The quantity L/R possesses dimension of time. |
| Reason: To reduce the rate of increase of current through a solenoid, we should we should increase the time constant \[\left( \frac{L}{R} \right)\]. |
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 :
induced emf, \[\left| \varepsilon \right|=\frac{Ldi}{dt}\] and current \[\left( i \right)=\frac{\varepsilon }{R}=\frac{1}{R}\times \frac{Ldi}{DT}\] or, \[\frac{L}{R}\frac{idl}{dt}=\frac{Current\times time}{Current}=time\] la order to reduce the rate of increase of current though a solenoid, we increase the time constant \[\left( \frac{L}{R} \right)\].
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