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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