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  4. If a copper wire is stretched to make its radius decrease by 0.1 %, then the percentage increase in resistance is nearly

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Q. If a copper wire is stretched to make its radius decrease by $0.1 \%$, then the percentage increase in resistance is nearly

Current Electricity

Solution:

For $x \%$ decrease in radius, increase in resistance is $4 \times \%$
$\Rightarrow 0.4 \%$