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A current of 80 mA flows through a wire having a cross section of 2.0 mm The
electrical resisitivity of the wire is 4.9 x 107 2 m. Assume there are approximately
4.0 x 1021 free electrons per cubic meter in the wire.
(a)
Calculate the drift velocity (va) of electron, electron mobility (He), and
electrical field (E) produce in the wire.
(i)
(ii)
Describe the motion the electrons in the wire.

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