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In the circuit shown (figure), the cell is ideal. The coil has an inductance of 4 H and zero resistance. F is a fuse of zero resistance and will blow when the current through it reaches 5 A. The switch is closed at t = 0. The fuse will blow

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after 2 s

after 5 s

after 10 s

answer is D.

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Detailed Solution

$E = L \frac{d I}{d t} o r d I = \frac{E}{L} d t$

$o r I = \frac{2}{4} t = 0.5 t \Rightarrow t = 2 I = 2 \times 5 = 10 s$

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