Assertion: The quantity `L//R` possesses dimensions of time.
Reason: To reduce the rate of increases of current through a solenoide should increase the time constant `(L//R)`.

Options

A. If both asseration and reason are true and reason is the correct explanation of assertion.
B. If both asseration and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer

B

Explanation

the relation of induced emf is `e=(Ldi)/(dt)` and current `i`
is given by `i=(e)/(R )=(1)/(R ).(L.di)/(dt)implies(di)/((dt)=i(R )/(L)=(i)/(L//R)`. In order to decrease the rate of increase of current through solenoid. We have to increase the time constant `(L)/(R )`.