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JEE Main 2021 (26 Feb, Shift 1) · P-N Junction Diode

P-N Junction Diode question from JEE Main 2021 (26 Feb, Shift 1)

Q77JEE Main 2021 · 26 FEB · SHIFT 1Medium

P-N Junction Diode

The circuit contains two diodes each with a forward resistance of 50 $\Omega$ and with infinite reverse resistance. If the battery voltage is 6V, the current through the 120 $\Omega$ resistance is ____________ mA.

Numerical answer type. Work it out, then open the answer.

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Answer: 20

The battery's positive terminal is on the left, so $D_1$ is forward biased and $D_2$ is reverse biased (open).
Current flows through $D_1$ ( $50\ \Omega$ ), $130\ \Omega$ and $120\ \Omega$ in series: $R = 50 + 130 + 120 = 300\ \Omega$ .
$I = \frac{6}{300} = 0.02$ A $= 20$ mA.

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