A copper wire of length 1X104
cm has a resistance of 5 Ω. Calculate the diameter of the
wire, given that the resistivity of copper is 1.7X10 - 8 Ωm.
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Given, Diameter = 0.5mm, resistivity = 1.6×
10-8ohm - m , resistance= 10ohm
we know that R = P 1/a => 1 = ra/p
Where A is the are of the cross section
= 10×3.13×(0.0005/2)²/1.6×10-8 = 122.7m
Thus the length of the wire is 122.7m
Hope It Helps u :)
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