JEE Main 2022 · 28 Jul · Shift 1 · Physics Q41

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PhysicsSingle correct+4 / -1Question 41 of 90

A 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 original resistance is :

9 : 1

1 : 9

4 : 1

3 : 1

Answer and worked solution

Official answer: A

Length tripled at constant volume, and $R\propto L^2$ : 9 : 1.

(A)

Topics:Ohm's law and resistivity

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JEE Main 2022 · 28 Jul · Shift 1, Physics question 41