John Henry Poynting FRS (9 September 1852 – 30 March 1914) was an English physicist. He was the first professor of physics at Mason Science College from 1880 to 1900, and then the successor institution, the University of Birmingham until his death.
Hi
I have a problem with task c)
For the Poynting vector ##\vec S## and the energy density ##\omega## I got the following:
$$\vec S= \frac{1}{\mu_0} \frac{4 I_0^2}{c \varrho} \frac{t}{c^2 t^2 - \varrho^2} \Theta(ct-\varrho)^2 \vec{e}_\varrho$$
$$\omega= \frac{1}{2} \epsilon_0 \frac{4 I_0^2...