Question

Calculate the resistivity of a copper wire having length 50m and diameter 1mm given resistivity is 1.7 multiplied 10rase to -8ohm meter

Answer 1

Area = πr^2
= 22 x 0.5 x 0.5/7
=0.786mm^2
resistance = resistivity x length/ Area
= 1.7 x 10^-8 x 50000/0.786
= 1.081 x 10^-3