Question

find resistiveity for: length=5metre, Area=1mm, row=10×10^(-8)​

Answer 1

Correct Question :

Find Resistance for

Lenght = 5m , Area = 1mm² , ${\sf \rho= 10 \times 10^{-8}\: ohm.m}$

Formula Used :

$\bullet\underline{\boxed{\sf R = \rho \dfrac{\ell}{A}}}$

Here ,

$\ell$ = Lenght of wire

$\rho$ = Resistivity

R = Resistance

A = Area of Cross-section

Solution :

✪ Convert Area form mm² to m²

➞ A = 1mm²

➞ A = ${\bf 10^{-6}\:m^2}$

$\implies{\sf R = 10^{-7} \times \dfrac{5}{10^{-6}} }$

$\implies{\sf R = 5 \times 10^{-1}\;ohm }$

$\implies{\bf R = 0.5 \: ohm}$

Answer :

Resistance will be 0.5Ω