Assignment:
In order to get an idea of the magnitude of magnetic forces, find the force per unit length between very long equal and opposite 10 ampere currents separated by 1 centimeter. Find the ratio of this to the weight per unit length of the copper wire described below.
Question 1. A copper wire 2.5 mm in diameter in carrying a current of 10 amperes. Assume one free electron per copper atom and find the magnitude of the drift velocity. (Copper has a density of 8.92g/cm3 and an atomic weight of 63.5grams/mole and Abogadro's number is 6.02 x 10^23/mole.