JEE Main 2026 · 6 Apr · Shift 1 · Physics Q43

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An inductor of inductance 10 mH having resistance of 100 Ω is connected to battery of E.M.F. 1.0 V through a switch as shown in the figure below. After switch is closed, the ratio of instantaneous voltages across the inductor when the current passing through it is 2 mA and 4 mA is ________.

A single loop: an inductor coil and a cell along the top, a switch (open) along the bottom.

4/3

3/4

5/3

3/5

Answer and worked solution

Official answer: A

Inductor voltage. $V_L=E-IR$ .

At 2 mA: $1-0.2=0.8$ V.
At 4 mA: $1-0.4=0.6$ V.

Ratio: $\tfrac43$ .

(A)

Topics:LR circuits

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JEE Main 2026 · 6 Apr · Shift 1, Physics question 43