JEE Main 2022 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 25 July 2022, Shift 1, Physics Q58

Question 58 of 90 in this shift, Physics question 28 of 30, Section B.

Eight copper wire of length

l

and diameter

d

are joined in parallel to form a single composite conductor of resistance

R

. If a single copper wire of length

2l

have the same resistance (

R

) then its diameter will be ______

d

Official answer

NTA final key (2022 Session 2).

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

Same idea in other shifts

Asked 3× in all

6 Apr 2023, Shift 1 · Q55The 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…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.