Question

The resistance of a metal wire of length 3 m is 60 Ω. If the area of cross-section of the wire is 4 × 10⁻² m², calculate the electrical resistivity of the wire.

Answer 1

Given:

R = 60 Ω,

L = 3 m, and

A = 4 × 10⁻² m²

We can rearrange the formula from part (i) to solve for electrical resistivity (ρ):

ρ = `R*A/L`

`p = (60xx4xx10^-2)/3 = 2.4/3 = 0.8 Ω⋅m`

p = 0.8 Ω × m