I am explaining why the north south pole version of magnets should not be the foundation of your understanding of magnetism. I use an argument, drawings (and experiments to follow in part 2). I show why the circular magnetic flux line around a straight line current is a better starting principle to derive all your thinking in electricity and electronics. Plus I show that the physical geometry of attraction and repulsion is wire to wire. Thus the centre of mass of the electricity flows can be used for physical design understanding, instead of just magnetic field flux lines.
4 x pi x r^2 is surface area of a sphere: math.about.com/od/formulas/ss/surfaceareavol.htm
2 x pi x r = circumference of a circle
MIT version, Lec 14 | MIT 8.02: youtube.com/watch?v=72P9wQeuf3Y
This was a nice review of all the electrostatics lessons:
lec 12 mit 8.02 electricity and magnetism spring 2002