If a wire is stretched such that its area of cross-section becomes (1 / n) times, then its resistance will became

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n times

n2 times

(1/ n) times

(1 / n2) times

answer is B.

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Detailed Solution

we know that R=ρlA∴ R=ρVA2 or R∝1A2∴ R1R2=A2A12=AnA2=1n2or R2=n2R1

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