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A current of 5 ampere is passing through...

A current of `5` ampere is passing through a metallic wire of cross-section area `4 xx 10^-6 m^2`. If the density of the charge carries in the wire is `5 xx 10^26 m^3`, find the drift speed of the electrons.
(b) In copper there are `10^22` free electrons per `c.c.`, all of which contribute to a current of `1` ampere in a wire of copper of `0.01 cm^2` cross-sectional area :
(i) What is the average speed of electrons in the copper ?
(ii) What is the electric field in the wire ?
Given specific resistance of copper `1.6 xx 10^-8 ohm-meter`.
( c) The area of cross-section, length and density of a piece of a metal of atomic weight `60` are `10^-6 m^2, 1.0 m` and `5 xx 10^3 kg//m^3` respectively. Find the number of free electrons per unit volume if every atom contributes one free electron. Also, find the drift velocity of electrons in the metal when a current of `16 A` passes through it. (Given : Avogadro number `6 xx 10^26//kg-"mole"`).

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