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

Options

A. increase by 0.2%
B. decrease by 0.2%
C. decrease by 0.05%
D. increase by 0.05%

Explanation

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