JEE Main 2024 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 1 February 2024, Shift 2, Physics Q50

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

In a metre-bridge when a resistance in the left gap is

2\,\Omega

and unknown resistance in the right gap, the balance length is found to be 40 cm. On shunting the unknown resistance with

2\,\Omega

, the balance length changes by :

(1)62.5 cm
(2)22.5 cmOfficial answer
(3)65 cm
(4)20 cm

Official answer

Option 2

NTA final key.

Chapter: Current Electricity
Topic: Wheatstone Bridge
Idea tested: Meter Bridge Principles

Same idea in other shifts

Asked 7× in all

31 Jan 2024, Shift 2 · Q49The resistance per centimeter of a meter bridge wire is $r$ , with $X\ \Omega$ resistance in left gap. Balancing length from left end is at…MediumSingle correct
26 Jul 2022, Shift 1 · Q56Resistances are connected in a meter bridge circuit as shown in the figure. The balancing length $l_1$ is 40 cm. Now an unknown resistance…MediumNumerical valueHas a figure
27 Jul 2022, Shift 1 · Q51In a meter bridge experiment, for measuring unknown resistance 'S', the null point is obtained at a distance 30 cm from the left side as…EasyNumerical valueHas a figure
27 Jul 2022, Shift 2 · Q52In the given figure of meter bridge experiment, the balancing length AC corresponding to null deflection of the galvanometer is 40 cm. The…MediumNumerical valueHas a figure
18 Mar 2021, Shift 2 · Q26Consider a 72 cm long wire AB as shown in the figure. The galvanometer jockey is placed at P on AB at a distance $x$ cm from A. The…EasyNumerical valueHas a figure
9 Jan 2020, Shift 2 · Q23In a meter bridge experiment S is a standard resistance. R is a resistance wire. It is found that balancing length is $l = 25$ cm. If R is…EasyNumerical 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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.