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Results tagged with homework-and-exercises
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user 124748
Applies to questions of primarily educational value - not only questions that arise from actual homework assignments, but any question where it is preferable to guide the asker to the answer rather than giving it away outright. Please READ THE GUIDANCE IN META before asking homework-like questions.
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Non-radiation charge density
If we can agree to that according to Goedecke it is enough to prove that the fourier transform in time and space is zero for all waves associated with the speed of light we can use the following route …
- 371
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Non-radiation charge density
For all $l,m$ but $l=0,m=0$, can we find $r_0,w_0$ such that the following charge distributions can represent a charge field that does not radiate:
$$
\rho(r,\theta,\phi) = \Re(c_{l,m} Y_{l,m}(\theta …
- 371