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Friday, 9 October

JEE Main 2024 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 29 January 2024, Shift 1, Physics Q42

Question 42 of 90 in this shift, Physics question 12 of 30, Section A.

A galvanometer having coil resistance 10 Ω10\,\Omega shows a full scale deflection for a current of 3mA. For it to measure a current of 8A, the value of the shunt should be:
  1. (1)3×10−3 Ω3\times10^{-3}\,\Omega
  2. (2)4.85×10−3 Ω4.85\times10^{-3}\,\Omega
  3. (3)3.75×10−3 Ω3.75\times10^{-3}\,\OmegaOfficial answer
  4. (4)2.75×10−3 Ω2.75\times10^{-3}\,\Omega

Official answer

Option 3

NTA final key.

Chapter
Moving Charges and Magnetism
Topic
Wheatstone Bridge
Idea tested
Shunting Galvanometer for Protection

Same idea in other shifts

Asked 3× in all
  1. 6 Apr 2026, Shift 2 · Q48A moving coil of galvanometer when shunted with 2 Ω\Omega resistance gives a full scale deflection for a current of 500 mA. When a…MediumNumerical value
  2. 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

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. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.