In one branch, 40 Ω resistance and a p-n junction diode are connected… | MHT CET 2026 (12 May, Shift 1)

Q13MHT CET 2026 · 12 MAY · SHIFT 1Medium

P-N Junction Diode

In one branch, $40\ \Omega$ resistance and a p-n junction diode are connected in series and in another branch, $40\ \Omega$ resistance is connected. Both the branches are connected in parallel to each other. The total resistance of the circuit when a) diode is forward biased and when b) diode is reverse biased respectively are {consider the p-n junction diode as an ideal diode}

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Answer: (c)

Forward biased ideal diode acts as a short: both $40\ \Omega$ branches in parallel, $R = \dfrac{40\times 40}{80} = 20\ \Omega$ .
Reverse biased ideal diode acts as an open switch: only one $40\ \Omega$ branch, $R = 40\ \Omega$ .
So the answer is (c) $20\ \Omega$ and $40\ \Omega$ .

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P-N Junction Diode question from MHT CET 2026 (12 May, Shift 1)

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