Physics question,need help solving it
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Physics question,need help solving it

[From: ] [author: ] [Date: 11-07-01] [Hit: ]
89g/cm^3 * Avogadro) pi*(0.v = 2 C/s /( (1.40 x 10^5 mol/m^3) (6.022 x 10^23 e/mol) (7.85x10^-7 m^2) (1.v = 1.......
Conductor has one conduction electron per atom.It's density is 8.89g/cm^3 and its atomic mass is 63.54g/mol.If a copper wire of diameter 1mm carries a current of 2A.What is the drift speed of electrons in the wire?
Ans of this ques is 1.9x10^-4m/s

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v = I / (n A q)
I is current (C/s)
n is charge density (carrier / m^3)
A is cross sectional area (m^2)
q is charge amount (C/carrier)

v = 2A / (1mol/63.54g * 8.89g/cm^3 * Avogadro) pi*(0.5mm)^2 e
v = 2 C/s /( (1.40 x 10^5 mol/m^3) (6.022 x 10^23 e/mol) (7.85x10^-7 m^2) (1.60x10^-19 C))

v = 1.88 x 10^-4 m/s
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