Electric fields. Electric Potential. Electric Currents. DC circuits. Magnetic Fields. The Vector Potential.
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Purcell, Electricity and Magnetism, 3rd ed. Cambridge University Press
Feynman, R.P., Leighton, R.B. and Sands, M., The Feynman Lectures on Physics, Vol. II, The New Millennium Edition: Mainly Electromagnetism and Matter Basic Books http://www.feynmanlectures.caltech.edu/