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Saturday, 31 October

JEE Main 2022 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 25 July 2022, Shift 2, Physics Q56

Question 56 of 90 in this shift, Physics question 26 of 30, Section B.

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

The figure, in words

Diamond-shaped network. Terminal A (marked +) on the left joins a left node; terminal B (marked -) on the right joins a right node. A diode symbol (triangle with bar) is drawn on each of the two upper sides, meeting at a top node: on the upper-left side the triangle points up toward the top node with the bar at the top-node end; on the upper-right side the triangle also points up toward the top node (from the right node) with the bar at the top-node end. A vertical 20 Ω resistor runs from the top node down to a bottom node; a 20 Ω resistor connects the left node to the bottom node; a 15 Ω resistor connects the bottom node to the right node.

Official answer

25

NTA final key.

Chapter
Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic
Semiconductor Diodes
Idea tested
Ideal vs. Practical Diode Circuit Analysis

Same idea in other shifts

Asked 12× in all
  1. 4 Apr 2026, Shift 1 · Q42Consider a circuit consisting of a capacitor (20 μ20\ \muF), resistor (100 Ω100\ \Omega) and two identical diodes as shown in figure. The…MediumDiagram basedHas a figure
  2. 8 Apr 2025, Shift 2 · Q45The output voltage in the following circuit is (Consider ideal diode case)MediumDiagram basedHas a figure
  3. 4 Apr 2024, Shift 1 · Q48The value of net resistance of the network as shown in the given figure is :MediumDiagram basedHas a figure
  4. 15 Apr 2023, Shift 1 · Q43In the given circuit, the current (I) through the battery will beMediumDiagram basedHas a figure
  5. 27 Jun 2022, Shift 2 · Q60The cut-off voltage of the diodes (shown in figure) in forward bias is 0.6 V. The current through the resister of 40 Ω\Omega is ________…MediumNumerical valueHas a figure
  6. 27 Aug 2021, Shift 1 · Q21A circuit is arranged as shown in figure. The output voltage Vo\mathrm{V_o} is equal to __________ V.MediumNumerical valueHas a figure
  7. 25 Feb 2021, Shift 1 · Q7A 5 V battery is connected across the points X and Y. Assume D1D_1 and D2D_2 to be normal silicon diodes. Find the current supplied by the…MediumDiagram basedHas a figure
  8. 26 Feb 2021, Shift 1 · Q28The circuit contains two diodes each with a forward resistance of 50 Ω\Omega and with infinite reverse resistance. If the battery voltage…MediumNumerical valueHas a figure

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.