Drift velocity, v = I/ nA
V = (5.5 x 10^17)/(6 x 10^28 x pi x (0.75 x 10^-3)^2)
V = 5.19 x 10^-6 m/s
B)
Time, t = mv/eE
t = (9.11 x 10^-31 x 5.19 x 10^-6)/(1.6 x 10^-19 x 0.0014) = 2.11 x 10^-14 sec
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