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16/07/2021 5:37 pm
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A wire is 1.0 m long, 0.2 mm in diameter and has a resistance of 10 Ω. Calculate the resistivity of its material?
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16/07/2021 5:40 pm
l = 1m
r = d/2 = 0.2/2 mm
= 0.1 mm = 0.0001m,
R = 10 ohm
We know that,
R = \(\rho \frac{I}{A}\)
\(\rho = \frac{RA}{I}\)
= \(\frac{10 \times \pi \times (0.0001)^2}{1}\)
= \(31.4 \times 10^{-8}\)