Resistance resists

Calculate resistance of a wire if the following are given -


\(Mass\) = \(50 g\)


\(Resistivity\) = \(1.8 * 10^{-9} ohm-metre\)


\(Length\) = \( 5 m\)


\(Density\) = \(1.8 * 10^{6} kg/m^{2}\)

Note by Sahba Hasan
2 years, 9 months ago

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Mass=volume×density. Volume=area×length. Resistance=resistivity×length÷area Resistance=resistivity ×length×length÷volume

Jilan Basha - 2 years ago

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\(R=\rho\cdot \dfrac{L}{A}\)

We only need to find \(A\). For that, first figure out what the volume is (using density and mass) and then divide it by L to get \(A\).

Rahul Saha - 2 years, 9 months ago

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5*10^{-15}

Madhav Srirangan - 2 years, 9 months ago

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  • Size of wire = Mass / Density = (50/1000) / (1.8*10^6) = S
  • Resistance = (Resistivity * Length) / Size = (1,810^-95) / S

L Tv - 2 years, 9 months ago

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Can you provide more detailed steps along with the answer? i tried the same method.

Sahba Hasan - 2 years, 9 months ago

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