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Circuit variable problem

A current of 1400 A exits in a rectangular (0.6 X 9.0)cm copper bus bar. The current is due to free electrons moving through the bus bar at an average velocity of v meters/second. If the concentration of free electrons is 10^29 electrons per cubic meter and if they are uniformly dispersed throughout the bus bar, then what is the average velocity of an electron?

I'm stuck on this problem. Please show step by step work.

Solution Preview

I=dQ/dt where Q is the total moving charges
=d(q*N)/dt ...

Solution Summary

This solution uses a rearranged version of the equation for current to simply solve for average velocity.