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Mar17-10, 07:05 AM
P: 16,987
The easiest way to think of this is to consider a standard dipole antenna. In a dipole antenna you have a current sloshing back and forth inside the antenna, but the current can't leave the ends of the antenna, so actually the amplitude of the current is highest in the middle and zero on the ends. This spatially and temporally varying current is the source of a spatially and temporally varying magnetic field. Similarly with charge and the e-fields, except that the amplitude of the charge is highest on the ends.