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Saturday, 31 October

JEE Main 2025 · PhysicsMultiple choiceDiagram basedMediumMulti-step

JEE Main 7 April 2025, Shift 1, Physics Q36

Question 36 of 75 in this shift, Physics question 11 of 25, Section A.

A wire of resistance R is bent into a triangular pyramid as shown in figure with each segment having same length. The resistance between points A and B is R/n. The value of n is :

The figure, in words

Triangular pyramid (tetrahedron) drawn in plane as a triangle with apex at top, base vertices A (bottom left) and B (bottom right), and a central vertex joined to all three corners; each of the six segments is a resistor of equal length. Points A and B are marked.
  1. (1)1010
  2. (2)1212Official answer
  3. (3)1414
  4. (4)1616

Official answer

Option 2

NTA final key.

Chapter
Current Electricity
Topic
Wheatstone Bridge
Idea tested
Hidden Wheatstone Bridges in Complex Networks

Same topic in other shifts

All Wheatstone Bridge questions
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  3. 6 Apr 2024, Shift 1 · Q40The value of unknown resistance (xx) for which the potential difference between BB and DD will be zero in the arrangement shown, is :MediumSingle correctHas a figure
  4. 9 Apr 2024, Shift 1 · Q50A galvanometer has a coil of resistance 200 Ω200\ \Omega with a full scale deflection at 20 μ20\ \muA. The value of resistance to be added to…EasySingle correct
  5. 1 Feb 2024, Shift 2 · Q50In a metre-bridge when a resistance in the left gap is 2 Ω2\,\Omega and unknown resistance in the right gap, the balance length is found to…MediumSingle correct
  6. 27 Jan 2024, Shift 1 · Q50A wire of length 10 cm and radius 7×10−4\sqrt{7}\times10^{-4} m is connected across the right gap of a meter bridge. When a resistance of 4.5…MediumSingle correct

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.