A) \[\sqrt{2}\]
B) e
C) \[{{e}^{-1}}\]
D) \[30{}^\circ \]
Correct Answer: D
Solution :
The circuit is shown in figure below Rise of current in L-R circuit is given by \[l={{l}_{0}}\,(1-{{e}^{-t/\tau }})\] where\[{{l}_{0}}=\frac{E}{R}\,=\frac{R}{5}\,=1\,A\] Now, \[\left( -\frac{\pi }{2},\frac{\pi }{2} \right)\] After 2s, i.e., at \[\left[ -\frac{\pi }{2},\frac{\pi }{2} \right)\] Rise of current, \[l=(1-{{e}^{-1}})A\,\,\,\,(\because \,-t/\tau \,=\frac{-2}{2}=-1)\]You need to login to perform this action.
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