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JEE Main 2023 (24 Jan, Shift 2) · Ohm's Law, Resistivity & Temperature

Ohm's Law, Resistivity & Temperature question from JEE Main 2023 (24 Jan, Shift 2)

Q23JEE Main 2023 · 24 JAN · SHIFT 2Medium

Ohm's Law, Resistivity & Temperature

If a copper wire is stretched to increase its length by 20%. The percentage increase in resistance of the wire is __________%.

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

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Answer: 44

Volume constant, so $R \propto l^2$ .
$R'/R = (1.2)^2 = 1.44$
Increase $= 44\%$ .

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