the resistance of a wire of length 20 metre is 2 ohm. if the area of cross section of the wire is 2×10^-7 m squared determine its resistivity and conductivity
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Answer: length = 20m
resistance=2 ohm
area = 2×10^-7 m^2
resistivity =2*2×10^-7/20
=4*10^-7/20
=2*10^-8
conductivity= 1/ resistivity
=1/2*10^-8
=0.5*10^8
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