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 x 10⁻² m², calculate the electrical resistivity of the wire.

Answer 1

Given:

R = 60 Ω,

L = 3 m, and

A = 4 x 10⁻⁶ m²

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

ρ = `R*A/L`

ρ = `((60 Ω) * (4 xx 10^(-6)m^2))/(3m)`

ρ = 8 × 10⁻⁵ Ω.m