The resistance of a wire is 'R' ohm. If it is melted and stretched to `n` times its origianl length, its new resistance will be

Options

A. `R/n`
B. `n^(2)R`
C. `R/(n^(2))`
D. `nR`

Answer

B

Explanation

`R=rhol//A`
`R'=(rho(nl))/(A//n)`
`(R')/R=n^(2)=R'=n^(2)R`