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JEE Main 2021 (26 Feb, Shift 2) · Ohm's Law, Resistivity & Temperature

Ohm's Law, Resistivity & Temperature question from JEE Main 2021 (26 Feb, Shift 2)

Q35JEE Main 2021 · 26 FEB · SHIFT 2Medium

Ohm's Law, Resistivity & Temperature

A 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 nearest integer is:

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Answer: (d)

Volume constant, so $R \propto l^2$ .
$R'/R = (1.25)^2 = 1.5625$
Increase $\approx 56\%$ . The answer is (d).

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