A copper wire of 3 m m 2 cross-sectional area carries a current 5 A . The magnitude of the drift velocity for the electrons in the wire is (Assume each copper atom contributes one free electron and density of copper = 8920 kg m - 3 , M Cu = 63 .5 kg mol - 1 )

Question

A copper wire of 3 m m 2 cross-sectional area carries a current 5 A . The magnitude of the drift velocity for the electrons in the wire is (Assume each copper atom contributes one free electron and density of copper = 8920 kg m - 3 , M Cu = 63 .5 kg mol - 1 ), 0 .24 m s - 1, 0 .12 m s - 1, 2.4 m s - 1, 0 .06 m s - 1

MARKS App · Accepted Answer

Given, A = 3 × 10 - 6 m 2 , I = 5 A , M Cu = 63 .5 kg mol - 1 ρ C u = 8920 kg m - 3 Electron density = 6.023 × 10 23 × 8920 63.5 = 8.46 × 10 25 m - 3 ∴ Drift velocity, v d = I e n A = 5 1.6 × 10 - 19 × 8.46 × 10 25 × 3 × 10 - 6 = 5 40.608 = 0 .12 m s - 1

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