Question

2) Calculate the resistance of a rectangle strip of copper length 0.08m,
thickness 15 mm and width 0.80mm
The resistivity of copper= 1.7 x 10-8 m

Answer 1

Given

l = Length = 0.08 m

t = Thickness = 15 mm

w = Width = 0.8 mm

$\rho$ = Resistivity of copper = $1.7 \times10^{-8}\ \Omega\text{m}$

To find

Resistance of the strip

Solution

A = Area = wt

Resistivity is given by

$\rho=R\dfrac{A}{l}\\\Rightarrow R=\rho\dfrac{l}{A}\\\Rightarrow R=\rho\dfrac{l}{wt}\\\Rightarrow R=\dfrac{1.7\times10^{-8}\times 0.08}{15\times 10^{-3}\times0.8\times 10^{-3}}\\\Rightarrow R=0.0001133\ \Omega$

The resistance of the copper strip is $0.0001133\ \Omega$