Calculate the resistivity of a metal of length 2m at 20°C having the resistance of 20 ohm and diameter 0.3mm
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R = 20 ohm
l = 2m = 2000mm
d = 0.3mm =
r= d/2 = 0.3/2 = 0.15mm
Cross-section Area = pi×r^2 = 22/7 × 0.0225
= 0.070mm^2
Resiativity = AR / l
= 0.070 × 20 / 2000
= 0.0007 = 7.0 × 10^-4 ohm mm
l = 2m = 2000mm
d = 0.3mm =
r= d/2 = 0.3/2 = 0.15mm
Cross-section Area = pi×r^2 = 22/7 × 0.0225
= 0.070mm^2
Resiativity = AR / l
= 0.070 × 20 / 2000
= 0.0007 = 7.0 × 10^-4 ohm mm
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