A copper wire iis stretched to make it 0...

A copper wire iis stretched to make it `0.1%` longer. What is the percentage change in its resistance?

A

increase by 0.2%

B

decrease by 0.2%

C

decrease by 0.05%

D

increase by 0.05%

Verified by Experts

`R=(pl)/A=(pI^2)/V [because` V=volume]
`therefore (Delta R)/R=2 (Delta l)/l=+0.2%`, p and V are constants

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