A) After 5 sec
B) After 2 sec
C) After 10 sec
D) Just after closing of S
Correct Answer: C
Solution :
[C]Applying Kirchoff voltage law \[E=L\frac{di}{dt}\] |
Where E=2V and L=4H |
\[di=\frac{E}{L}dt\] |
\[\int\limits_{0}^{i}{\,di=\int\limits_{0}^{t}{\frac{E}{L}dt}}\] |
\[i=\frac{E}{L}t\] |
\[i=\frac{2}{4}t=0.5t\] |
\[i=0.5\,\,t\] |
Fuse will blow when i become 5A |
So 5=0.5 t |
\[t=10\sec \] |
After 10 sec F will blow |
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