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JEE Main 2019 (12 Jan, Shift 1) · Inductors & DC Transients (Mixed)

Inductors & DC Transients (Mixed) question from JEE Main 2019 (12 Jan, Shift 1)

Q19JEE Main 2019 · 12 JAN · SHIFT 1Medium

Inductors & DC Transients (Mixed)

In the figure shown, a circuit contains two identical resistors with resistance R = 5 $\Omega$ and an inductance with L = 2mH. An ideal battery of 15 V is connected in the circuit. What will be the current through the battery long after the switch is closed?

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Answer: (a)

Long after closing, the inductor behaves like a plain wire.
The two $5\ \Omega$ resistors are then in parallel: $R_{eq} = 2.5\ \Omega$ .
$i = \frac{15}{2.5} = 6\text{ A}$
So the answer is (a) 6 A.

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