JEE Main 2024 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 4 April 2024, Shift 2, Physics Q55

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

Two wires

A

and

B

are made up of the same material and have the same mass. Wire

A

has radius of 2.0 mm and wire

B

has radius of 4.0

mm

. The resistance of wire

B

is 2

\Omega

. The resistance of wire

A

is __________

\Omega

Official answer

NTA final key.

Chapter: Current Electricity
Topic: Ohm's Law and Resistance
Idea tested: Resistance of Stretched Wires

Same idea in other shifts

Asked 8× in all

6 Apr 2024, Shift 1 · Q58A wire of resistance $R$ and radius $r$ is stretched till its radius became $r/2$ . If new resistance of the stretched wire is $x\,R$ , then…EasyNumerical value
12 Apr 2023, Shift 1 · Q42A wire of resistance 160 $\Omega$ is melted and drawn in a wire of one-fourth of its length. The new resistance of the wire will beEasySingle correct
28 Jul 2022, Shift 1 · Q41A wire of resistance $R_1$ is drawn out so that its length is increased by twice of its original length. The ratio of new resistance to…EasySingle correct
29 Jul 2022, Shift 2 · Q35A 1 m long wire is broken into two unequal parts X and Y. The X part of the wire is streched into another wire W. Length of W is twice the…MediumSingle correct
25 Jun 2022, Shift 2 · Q58The length of a given cylindrical wire is increased to double of its original length. The percentage increase in the resistance of the…EasyNumerical value
3 Aug 2021, Shift 1 · Q23The length of a wire is increased by 20% by stretching. The percentage increase in resistance of wire will be ______.EasyNumerical value
26 Feb 2021, Shift 2 · Q20A wire of 1 $\Omega$ has a length of 1 m. It is stretched till its length increases by 25%. The percentage change in resistance to the…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.