If a copper wire is stretched to make it...

If a copper wire is stretched to make it `0.1%` longer wha is the percentage change in its resistance?

A

`0.1%`

B

`0.2%`

C

`0.4%`

D

`0.8%`

Verified by Experts

The correct Answer is:

B

`R= (rho l)/(A) , m =A l d`
`:.R =(rho l (ld))/(m) " " :. R prop l^(2)`
`:. (DeltaR)/(R ) xx 100 =2(Deltal)/(l) xx 100 =2xx0.1 =0.2%`

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