A wire of length 1m and radius 0.1 mm has a resistance of 100Ω. Find the resistivity of the material.
Given - R = 100 ohm;
l = 1 m
r = 0.1 mm = 0.0001 m
To find resistivity = ?
We know R = ρ l/A
ρ = 
where A = cross sectional area
A = πr2
A = 
x 0.0001 x 0.0001
A = 0.00000022/7 m2
ρ = 
Resistivity = 3.142 e-6 ohm.m
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