JEE Main 2024 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 9 April 2024, Shift 1, Physics Q50

Question 50 of 90 in this shift, Physics question 20 of 30, Section A.

A galvanometer has a coil of resistance

200\ \Omega

with a full scale deflection at

20\ \mu

A. The value of resistance to be added to use it as an ammeter of range

(0\text{-}20)

mA is :

(1) $0.50\ \Omega$
(2) $0.10\ \Omega$
(3) $0.20\ \Omega$ Official answer
(4) $0.40\ \Omega$

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

6 Apr 2026, Shift 2 · Q48A moving coil of galvanometer when shunted with 2 $\Omega$ resistance gives a full scale deflection for a current of 500 mA. When a…MediumNumerical value
29 Jan 2024, Shift 1 · Q42A galvanometer having coil resistance $10\,\Omega$ shows a full scale deflection for a current of 3mA. For it to measure a current of 8A,…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.