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A straight copper wire of length l = 1000 m and cross-sectional area S = 1.0 mm2 carries a current I = 4.5 A. Assuming that one free electron corresponds to each copper atom, find:
(a) The time it takes an electron to displace from one end of the wire to the other;
(b) The sum of electric forces acting on all free electrons in the given wire. |
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