Student Login

Home›Chapters›Current Electricity PYQs›Ohm's Law, Resistivity & Temperature›Question 22

JEE Main 2023 (6 Apr, Shift 1) · Ohm's Law, Resistivity & Temperature

Ohm's Law, Resistivity & Temperature question from JEE Main 2023 (6 Apr, Shift 1)

Q22JEE Main 2023 · 6 APR · SHIFT 1Medium

Ohm's Law, Resistivity & Temperature

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 __________.

Numerical answer type. Work it out, then open the answer.

Show answer and solution

Answer: 25

$R = \rho l/A \propto l/A$ .
$R'/R = \dfrac{1.20}{0.96} = 1.25$
Increase $= 25\%$ .

Report a mistake

More questions on Ohm's Law, Resistivity & Temperature

If a copper wire is stretched to increase its length by 20%. The percentage increase in…JEE Main 2023 (24 Jan, Shift 2)
The reciprocal of resistance is:NEET 2022 (Phase 2)
A wire of resistance R1 is drawn out so that its length is increased by twice of its…JEE Main 2022 (28 Jul, Shift 1)
An aluminium wire is stretched to make its length, 0.4% larger. The percentage change in…JEE Main 2022 (26 Jun, Shift 1)
The length of a given cylindrical wire is increased to double of its original length. The…JEE Main 2022 (25 Jun, Shift 2)
Given below are two statements: one is labelled as Assertion A and the other is labelled…JEE Main 2022 (29 Jul, Shift 2)
Resistance of the wire is measured as 2 Ω and 3 Ω at 10 ° C and 30 ° C respectively…JEE Main 2022 (28 Jun, Shift 2)
The variation of applied potential and current flowing through a given wire is shown in…JEE Main 2022 (29 Jun, Shift 1)