JEE Main 2023 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 6 April 2023, Shift 1, Physics Q55

Question 55 of 90 in this shift, Physics question 25 of 30, Section B.

The length of a metallic wire is increased by 20% and its area of cross section is reduced by 4%. The percentage change in resistance of the metallic wire is ____________

Official answer

NTA final key.

Chapter: Current Electricity
Topic: Ohm's Law and Resistance
Idea tested: Resistivity and Geometry

Same idea in other shifts

Asked 3× in all

25 Jul 2022, Shift 1 · Q58Eight copper wire of length $l$ and diameter $d$ are joined in parallel to form a single composite conductor of resistance $R$ . If a…EasyNumerical value
2 Sep 2020, Shift 1 · Q12Consider four conducting materials copper, tungsten, mercury and aluminium with resistivity $\rho_C$ , $\rho_T$ , $\rho_M$ and $\rho_A$ …MediumSingle 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.