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Q.

The resistance of a wire is ‘R’ ohm. It is melted and stretched to ‘n’ times its original length its new resistance will be

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a

R/n

b

n²R

c

R/n²

d

nR

answer is D.

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Detailed Solution

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$R \propto l^{2} \Rightarrow \frac{R}{R^{1}} = {(\frac{l}{nl})}^{2}$
R¹ = n²R

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The resistance of a wire is ‘R’ ohm. It is melted and stretched to ‘n’ times its original length its new resistance will be