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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceDiagram basedMediumApplication

JEE Main 31 August 2021, Shift 2, Physics Q9

Question 9 of 90 in this shift, Physics question 9 of 30, Section A.

The equivalent resistance of the given circuit between the terminals A and B is :

The figure, in words

Circuit: top wire runs from the left edge through a 2 Ω resistor, then another 2 Ω resistor, to terminal A; the bottom wire runs from the left edge to terminal B. Four resistors are connected vertically between the top and bottom wires, left to right: 5 Ω, 2 Ω, 3 Ω, 3 Ω (the last two side by side). The far-left edge is a plain wire joining the top and bottom wires.
  1. (1)0 Ω0\ \Omega
  2. (2)3 Ω3\ \Omega
  3. (3)1 Ω1\ \OmegaOfficial answer
  4. (4)92 Ω\frac{9}{2}\ \Omega

Official answer

Option 3

NTA final key.

Chapter
Current Electricity
Topic
Kirchhoff's Laws
Idea tested
Short Circuits and Equipotential Nodes

Same idea in other shifts

Asked 3× in all
  1. 8 Apr 2023, Shift 2 · Q50The equivalent resistance between A and B as shown in figure is:EasySingle correctHas a figure
  2. 29 Jul 2022, Shift 1 · Q55The current I flowing through the given circuit will be __________ A.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.