charged line

primka_elektrickypotencial1  \iint_S \mathbf{E} \mathrm{d} \mathbf{S} = E (r) S = E (r) 2 \pi r l = \frac{\tau l}{\epsilon_0}

E(r) = \frac{\tau}{2 \pi \epsilon_0} \frac{1}{r}<br />

\varphi (r) = - \int E (r) \textrm{d} r + K = \frac{\tau}{2 \pi \epsilon} \ln \frac{1}{r} + K

 

 

primka_elektrickypotencial2

 

elektrickypotencial_2dgraf1 elektrickaintenzita_2dgraf2