Introduction to Electrodynamics (5th Edition)
by David J. Griffiths · Cambridge University Press
The standard junior-level electrodynamics text, now published by Cambridge. Builds Maxwell's equations from electrostatics and magnetostatics, then treats conservation laws, wave propagation in media, potentials and fields, radiation, and relativistic electrodynamics, with computational problems in Mathematica. Nothing else explains why the equations take the form they do with this clarity.
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