# How can electrons move along the conductive wire? ( seems to be a paradox )

Tangential components of the electric field across an interface between two media, with no impressed magnetic current densities along the boundary of the interface, are continuous. So: $n \times (E_2 - E_1) = 0$. Now suppose an lumped circuit with some elements that are connected with infinite electric conductivity wire $(\sigma = \nsim)$ $\longrightarrow E_1t =E_2t = 0$ (in the wire and cylinder). What makes electrons move along the cylinder when there are no tangential components of the electric field?

lumped circuits : http://en.wikipedia.org/wiki/Lumped_element_model

• could you link to an image of what sort of circuit this is? – anna v Mar 8 '14 at 13:53
• @annav: better ? – rza Mar 8 '14 at 20:53