Q.

Statement 1: The quantity L/R possesses dimensions of time.Statement 2: To reduce the rate of increases of current through a solenoid, one should increase the time constant (L/R).

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a

Both statements 1 and 2 are correct

b

Statement 1 is correct statement 2 is incorrect

c

Statement 1 is incorrect statement 2 is correct

d

Both statements 1 and 2 are incorrect

answer is A.

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Detailed Solution

The  current i is given by i=ER(1-e-RtL )=ER(1-e-tτ )  ⇒didt=ERτ e-tτ  In order to decreases the rate of increase of current through solenoid, we have to increase the time constant LR.Also LR=ϕ/iv/i=φv=volt secvolt=sec
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