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16/07/2021 5:41 pm
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What will be the resistance of a metal wire of length 2 metres and area of cross-section 1.55 × 10-6 m2, if the resistivity of the metal be 2.8 × 10-8 Ωm?
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16/07/2021 5:46 pm
I = 2 m
A = 1.55 x 10-6 m2
\( \rho \) = 2.8 x 10-8 Ωm
R = \(\rho \frac{I}{A}\)
= \(2.8 \times 10^{-8}\times\frac{2}{1.55 \times 10^{-6}}\)
= 0.036 Ω