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A straight copper-wire of length 100m an...

A straight copper-wire of length 100m and cross-sectional area 1.0`mm^(2)` carries a current 4.5A. 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 electroc forces acting on all free electrons in the given wire. given resistivity of copper is `1.72xx10^(-8)Omega-m` and density of copper is `8.96g//cm^(3)`.

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