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April 17, 2014

Homework Help: physics

Posted by pam on Saturday, March 10, 2012 at 10:06pm.

An iron wire has a cross-sectional area equal to 1.20 10-5 m2. Carry out the following steps to determine the drift speed of the conduction electrons in the wire if it carries a current of 34.0 A.
(a) How many kilograms are there in 1.00 mole of iron?
1 kg/mol

(b) Starting with the density of iron and the result of part (a), compute the molar density of iron (the number of moles of iron per cubic meter).
2 mol/m3

(c) Calculate the number density of iron atoms using Avogadro's number.
3 atoms/m3

(d) Obtain the number density of conduction electrons given that there are two conduction electrons per iron atom.
4 electrons/m3

(e) Calculate the drift speed of conduction electrons in this wire.
5 m/s

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