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Q.

The resistance of a wire is ‘R’ ohm. If it is melted and stretched to ‘n’ times its original length, its new resistance will be :-

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a

$\frac{R}{n^{2}}$

b

$\frac{R}{n}$

c

$n^{2} R$

d

nR

answer is B.

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Detailed Solution

$R = \frac{ρ l^{2}}{V}, R \propto l^{2}$

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