A) almost at once
B) after 2 s
C) after 5 s
D) after 10 s
Correct Answer: D
Solution :
\[\varepsilon =\frac{Ldi}{dt}\]\[\Rightarrow \]\[di=\frac{E}{L}dt\]\[\Rightarrow \]\[i=\frac{2}{4}t\] \[\therefore \] \[t=\frac{5\times 4}{2}=10\,s\]You need to login to perform this action.
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