JEE Main 2025 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 2 April 2025, Shift 2, Physics Q48

Question 48 of 75 in this shift, Physics question 23 of 25, Section B.

The length of a light string is 1.4 m when the tension on it is 5 N. If the tension increases to 7 N, the length of the string is 1.56 m. The original length of the string is __________ m.

Official answer

NTA final key.

Chapter: Mechanical Properties of Solids
Topic: Elasticity
Idea tested: Finding Natural Length from Two Tensions

Same idea in other shifts

Asked 3× in all

29 Jun 2022, Shift 1 · Q36A wire of length L is hanging from a fixed support. The length changes to $L_1$ and $L_2$ when masses 1 kg and 2 kg are suspended…MediumSingle correct
26 Feb 2021, Shift 2 · Q15The length of metallic wire is $l_1$ when tension in it is $T_1$ . It is $l_2$ when the tension is $T_2$ . The original length of the wire…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 108 of the 174 JEE Main shifts held from 2017 to 2026.