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Clash Royale CLAN TAG #URR8PPP up vote 4 down vote favorite There are lots of posts about EM wave model of photons, but I haven;t read one that covers the more specific question I am focusing on here. Here How does energy transfer between B and E in an EM standing wave? david was concerned about the presence of a zero $E$ & $B$ field point in the wave, close, but that is not my concern. An electromagnetic waves is propagated by the oscillations of the electric and magnetic fields. A changing electric field produces a changing magnetic field and a changing magnetic field produces a changing electric field. An electromagnetic wave is self propagating and does not need a medium to travel through. But I can't overcome the idea that in order to achieve propagation an $dot E$ or $dot B$ in one place must be capable of inducing a $dot B$ or $dot E$ in a different place. How do we understand a change in position to occur? In Maxwells Vacuum Equations (such as $nabla times...