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  4. If the current through an inductor of 1 H is given by i=t sin t, then voltage across the inductor is

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Q. If the current through an inductor of $1\, H$ is given by $i=t \sin t$, then voltage across the inductor is

Solution:

Induced emf $(e)=\frac{-L d i}{d t}$
$e=-1(\sin t+t \cos t)$
$e=-\sin t-t \cos t$