The resistance per metre length of a wire is `10 Omega`. If the resistivity of the material of the wire is `50 xx 10^(-8)` ohm metre, find the area of cross- section of the wire.

Explanation

`R = (rhol)/(A)`
`10= (50xx10^(-8)xx1)/(A)`
`A= (50xx10^(-8)xx1)/(10)= 5xx10^(8) m^(2)`