Question

Calculate the resistance of an aluminium cable of length 10 km and diameter 2.0 mm if the resistivity of
aluminium is 2.7 x 10-8 Ωm.​

Answer 1

Explanation:

Given

length of the aluminium cable(l)=10km=10^4m

resistivity(p)=2.7×10^-8 ohm-m

radius=10^-3m

Area (A)=3.14×10^-6m^2

Resistance (R)=pl/A

=2.7×10^-8×10^4/3.14×10^-6

=86ohms