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Time average of product of 2 function with same frequency
Hi I'm Reading a notebook on "light atom interactions"
There is this calculation I don't understand of average power -
$$P=\overline{-\boldsymbol{E} \cdot \frac{\mathrm{d} D}{\mathrm{~d} t}}=...
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Energy of a dipole?
Suppose that we have a perfect dipole with $+q$ at $\vec{r}+\vec{d}$ and -q at $\vec{r}$, and that this dipole is in a uniform electric field $\vec{E}$,
Then:
\begin{equation}U=-\vec{p}\cdot \vec{E}....
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