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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceDiagram basedMediumData or graph

JEE Main 26 June 2022, Shift 1, Physics Q49

Question 49 of 90 in this shift, Physics question 19 of 30, Section A.

The I-V characteristics of a p-n junction diode in forward bias is shown in the figure. The ratio of dynamic resistance, corresponding to forward bias voltage of 2 V and 4 V respectively, is :

The figure, in words

Graph of I (mA) on the vertical axis against V (volt) on the horizontal axis: a curve from the origin O rising slowly then steeply. Vertical axis marks 5, 10, 200, 250; horizontal axis marks 2, 2.1, 4, 4.2. Dashed lines from the curve to the axes at (2 V, 5 mA), (2.1 V, 10 mA), (4 V, 200 mA), (4.2 V, 250 mA).
  1. (1)1 : 2
  2. (2)5 : 1Official answer
  3. (3)1 : 40
  4. (4)20 : 1

Official answer

Option 2

NTA final key.

Chapter
Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic
Semiconductor Diodes
Idea tested
Dynamic Resistance Calculation

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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.