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Both electric and magnetic fields have single direction, because it is a plane wave, propagating in single direction. All directions are perpendicular to each other. From Maxwell's equations is follow …

Has this problem been solved since? Not in the sense Feynman meant. Approximate way to describe action of one charged part of body on another is known since Lorentz - the so-called Lorentz-Abrah …

For something to be called an electromagnetic wave, do we need to have sinusoidal oscillations of electric and magnetic fields? Not at all. The electric and magnetic field are rational functions …

Is the above reasoning correct Yes, provided the Larmor formula applies. Larmor's formula was obtained based on some assumptions: 1) The Poynting theorem is applicable and can be interpret …

The Larmor formula derivation does not assume circular motion, it can hold for any accelerated motion. The major assumptions in its derivation are: that the field around the particle by which we judge …

In a cavity of dimension L, the wave must give zero amplitude at the wall, means wave equation has zero amplitude. Why? The cavity is supposed to be made of metal with low resistance. For freque …

Yes, external EM wave permeates all space its wavefront reaches, there is no way for the atom to shield its interior from it. This is known to be true due to both theoretical reasons - Maxwell's equat …

Wave produced by brief accelerated motion is not periodic train, but a glimmer. The concept of frequency does not apply to such a wave.

My question is what does orbits with definite energy mean? It means that electron circumscribes an ellipse and the total energy of the system nucleus + electron is constant; when the electron is …

in the rest frame of the particle moving with acceleration $\textbf{a}$ the amount $dW$ of radiated energy over time $dt$ is $$ dW \propto \textbf{a}^2 dt $$ so the particle loses energy $d …

The Larmor formula gives EM energy per unit time that flies through big sphere centered in accelerated charged body and whose surface is far away from the particle, where the EM field is almost equal …

In deriving the Rayleigh-Jeans and Planck's laws, we are examining a perfectly reflecting cavity filled with radiating ideal gas. The gas does not have to be ideal. Ideal gas is too simple a mode …

Isn't induced EMF in an antenna dependent on the power of the electromagnetic wave? Indeed it is not - for given antenna geometry, the induced EMF due to external wave depends only on electric field …

Again considering the dot product of the EoM with ${\vec v}$, $$\frac{d}{dt}\left(\frac{1}{2}mv^2\right)=\frac{\mu_0q^2}{6\pi c}{\vec v}\cdot\ddot{\vec v}.$$ This equation cannot be correct (as @Due …

The emission process always takes some time. How much depends on the kind of transition. If the transition is spontaneous dipole transition, like when excited electronic state of an atom decays, the r …