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← JEE Main 2022 · 25 Jul · Shift 2
PhysicsInteger+4 / -1Question 56 of 90

JEE Main 2022 · 25 Jul · Shift 2, Physics question 56

Two ideal diodes are connected in the network as shown is figure. The equivalent resistance between A and B is ______ Ω\Omega.

Diamond network between A (+) and B (−): the upper-left arm has an ideal diode pointing up towards the top node, the upper-right arm a diode from B side pointing up to the top node (reverse); a 20 Ω resistor joins top and bottom nodes; the lower-left arm is 20 Ω and the lower-right arm 15 Ω.
Answer and worked solution

Official answer: 25

Diodes. The upper-left diode conducts (A is +), shorting A to the top node; the upper-right diode is reverse biased.

Network. Top-to-bottom 20 Ω in parallel with A-to-bottom 20 Ω gives 10 Ω, then 15 Ω to B: 25 Ω.

Answer: 25

Topics:Semiconductors and p-n junctionSeries and parallel resistors
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