A silver wire of diameter 1 mm carries a current of 130 mA. The density of conduction electrons in silver is 5.8X10^28 m-3. How long (on average) does it take for a conduction electron to move 1.0 cm along the wire?(adsbygoogle = window.adsbygoogle || []).push({});

ok, so first I calculated drift speed using the equation Vd = I/ Ne * A

for Area, I just used pi*r^2

I set it up Vd = .130A/ ((5.8e28 m^-3) x (7.853e-7 m^2)) and got the drift speed to be 2.8538e-24 m/s

I then set up 2.8538e-24 m/s x 100cm/m x 60sec/min and got

1.71228e-20cm/ min .

To get minutes for one cm i took

1cm/1.71228e-20cm/ min and got 5.840e19 minutes to move one cm.

i'm obviously doing somehting wrong because it's not accepting my answer. Is there something I'm missing??

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# Homework Help: Drift speed

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