Question

The resistance per metre length of a wire is 10 ohm if tge resistivity of the material of the wire is 50×10^-8ohm metres find the area of cross section of the wire

Answer 1

a wire is 100. It the resistivity of the material of the will is 50 x 10-8ohm metre, find the area of cross-section of the wire.

Answer 2

Given :-

$\mathsf{Resistivity\:p=50\times10^{-8} ohm\: m.}$

$\mathsf{Resistance = 10\:ohm}$

To Find :-

Area of cross section (A)

Solution :-

$\implies\mathsf{R =\frac{pl}{A}}$

$\implies\mathsf{10=\frac{50\times{10}^{-8}\times1}{A}}$

$\mathsf{\implies\:A=\frac{50\times 10^{- 8}\times1}{10}}$

$\implies\mathsf {A= 5\times10^{-8}{m}^{2}}$