I'm really stuck on this one problem:(adsbygoogle = window.adsbygoogle || []).push({});

"A small but measurable current of 4.20E-10 A exists in a copper wire whose diameter is 0.02 cm. Calculate the electron drift speed (in meters/second)."

Source: Serway and Jewett

I know that:

I = 4.20E-10 A

n = 8960 kg/m^3

q = 1.6E-19 C

d = 2E-4 m

J = (I/A) = n x q x v

Thus, v = I/(n x q x A)

What does A stand for and how would I go about finding it? Also, am I converting things correctly and using the proper value for the density?

Any help would be greatly appreciated.

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# Electron drift speed in a copper wire.

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