JEE Main 2023 · PhysicsMultiple choiceDiagram basedMediumDiagram reading

JEE Main 10 April 2023, Shift 2, Physics Q43

Question 43 of 90 in this shift, Physics question 13 of 30, Section A.

If each diode has a forward bias resistance of 25

\Omega

in the below circuit, which of the following options is correct:

The figure, in words

Circuit: three parallel branches, each a diode in series with a 125 ohm resistor (D1, D2, D3 from top to bottom; D1 and D3 drawn forward-biased, D2 drawn with its arrow pointing the opposite way, i.e. reverse-biased), with currents I4, I3 (and I2) marked by arrows entering the branches from the left; this parallel combination is in series with a 25 ohm resistor and a 5 V battery; I1 and I2 marked on the left wire near the battery.

(1) $\frac{I_1}{I_2} = 1$
(2) $\frac{I_2}{I_3} = 1$
(3) $\frac{I_3}{I_4} = 1$
(4) $\frac{I_1}{I_2} = 2$ Official answer

Official answer

Option 4

NTA final key.

Chapter: Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic: Semiconductor Diodes
Idea tested: Forward and Reverse Biasing

Same idea in other shifts

Asked 6× in all

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.