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    i wasnt in my lesson and was given a sheet that has a few simple problems on it. the first one is what is the drift speed of electrons in a copper wire of cross sectional area 1mm^2, carryng a current of 0.2 A

    so i know I = 0.2, A = 1 x 10^-6 m^2, q = 1.6 x 10^-19, but what does n =? its the charge density, not really sure how to work it out?

    thanks!

    xxx
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    For copper, n = 8.5 × 10^28 per m3
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    I = N A v e
 
 
 
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