Question

What is the conductivity (in Mhos/m) of a 2 Ohm circular wire, when the length and the diameter of the wire are 10 m and 0.8 m respectively?

Answer 1

Answer:

Given :   R=2Ω            l=1 m            d=0.4 mm =0.0004 m

Cross section area of wire       A=4πd2=4π×(0.0004)2=1.256×10−7 m2 

Resistivity of the material       ρ=lRA

∴   ρ=12×1.256×10−7=2.514×10−7  Ωm

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