"The current in a 1.70mm x 1.70mm square aluminum wire is 1.70 A. What are (a) the current density [in MA/m^2] and (b) the electron drift speed [in micrometers/second]?"
J = I/A
The Attempt at a Solution
I plugged in the values for current (1.7 Amps) and the area (I got 2.89*10^-6 meters squared) into J = I/A, and I get an answer of 588235 A/m^2, which ended up being wrong. I rather saw this coming, since the question asked for an answer in MA/m^2...but I have no idea what they're talking about with that capital M! Does anyone have any idea what's going on with that?
(of course, also - could someone help me get started with the second part?)