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JEE Main 2020 (9 Jan, Shift 1) · P-N Junction Diode

P-N Junction Diode question from JEE Main 2020 (9 Jan, Shift 1)

Q86JEE Main 2020 · 9 JAN · SHIFT 1Difficult

P-N Junction Diode

Both the diodes used in the circuit shown are assumed to be ideal and have negligible resistance when these are forward biased. Built in potential in each diode is 0.7 V. For the input voltages shown in the figure, the voltage (in Volts) at point A is __________.

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

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Answer: 12

The left diode has its anode at $12.7$ V and cathode at A, so it is forward biased.
$V_A = 12.7 - 0.7 = 12$ V.
The right diode has anode at $4$ V and cathode at A ( $12$ V), so it is reverse biased and does not affect A.
$V_A = 12$ V.

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