The resistance of a wire 2.5 m long and 0.9 mm in diameter is 0.07 ohm. What is the resistivity of the material of the wire?
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l=2.5m
d=0.9mm=> r=d/2=0.9/2=0.45mm=0.45x10⁻³m
R=0.07Ω
R=ρl/a
ρ=Ra/l
=(0.07 XπX0.45²X10⁻⁶)/2.5
= 1.78x10⁻⁸Ωm
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