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Q.

A cylindrical copper wire is stretched such that its diameter decreases by 0.01%. The approximate percentage increase in its resistance is :

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a

0.02%

b

0.04%

c

0.08%

d

0.16%

answer is B.

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Detailed Solution

R∝1A2∝1r4RR=4ΔrrΔRR×100=0.04%
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