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Q.

A wire of radius r has resistance R. If it is stretched to a wire of radius r/2 then the resistance of the wire becomes

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a

2R

b

4R

c

16R

d

Zero

answer is C.

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Detailed Solution

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$R \propto \frac{1}{r^{4}}$ when volume is constant.

if r becomes r/2 resistance increases to 16 times.

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