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in Current Electricity by (48.7k points)
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A copper wire has a resistance of 10 Ω. and an area of cross-section 1 mm2 . A potential difference of 10 V exists across the wire. Calculate the drift speed of electrons if the number of electrons per cubic metre in copper is 8 x 1028 electrons.

1 Answer

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Best answer

Here, R = 10 Ω, A = 1 mm2 = 10-6m2, V = 10V, 

n = 8 x 1028 electrons/m3

Now,

I = enAVd

∴ \(\frac{V}{R}\) = enAV(or) V\(\frac{V}{enAR}\)

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