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Saturday, 31 October

JEE Main 2024 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 6 April 2024, Shift 1, Physics Q40

Question 40 of 90 in this shift, Physics question 10 of 30, Section A.

The value of unknown resistance (xx) for which the potential difference between BB and DD will be zero in the arrangement shown, is :

The figure, in words

Bridge circuit with nodes A, B, C, D; battery of 14.5 V connected between A and C. Between A and B: 24 ohm resistor and two 12 ohm resistors. Between B and C: two 1 ohm resistors. Between A and D: x ohm resistor and two 12 ohm resistors. Between D and C: 0.5 ohm resistor.
  1. (1)42 Ω42\ \Omega
  2. (2)6 Ω6\ \OmegaOfficial answer
  3. (3)3 Ω3\ \Omega
  4. (4)9 Ω9\ \Omega

Official answer

Option 2

NTA final key.

Chapter
Current Electricity
Topic
Wheatstone Bridge
Idea tested
Balanced Bridge Equation

Same idea in other shifts

Asked 3× in all
  1. 28 Jun 2022, Shift 1 · Q53Current measured by the ammeter (A) in the reported circuit when no current flows through 10 Ω\Omega resistance, will be __________ A.MediumNumerical valueHas a figure
  2. 8 Jan 2020, Shift 1 · Q24Four resistances of 15 Ω\Omega, 12 Ω\Omega, 4 Ω\Omega and 10 Ω\Omega respectively in cyclic order to form Wheatstone's network. The…EasyNumerical value

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.