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Jan 26 at 1:42 answer added Puk timeline score: 2
Jan 26 at 0:40 history edited Qmechanic CC BY-SA 4.0
deleted 33 characters in body; edited tags
Jan 25 at 20:43 history became hot network question
Jan 25 at 17:46 comment added Ján Lalinský Conductors in usual low frequency circuits have $\rho = 0$ inside, non-zero charge density can be only on their surface. But on the surface, the local Ohm law $\mathbf j = \sigma \mathbf E$ does not hold, because current component perpendicular to the surface can be zero, while electric field is not, so the two vectors are not parallel. Also, $\sigma$ is not position independent on the surface. One can have non-zero charge density on the surface while divergence of $\mathbf j$ is zero, this is e.g. when the surface charge is constant in time.
Jan 25 at 16:45 answer added The Photon timeline score: 2
Jan 25 at 16:33 history edited Thomas Fritsch CC BY-SA 4.0
Kirchhoff with ff
Jan 25 at 13:28 vote accept Niclas
Jan 25 at 13:21 answer added Alex timeline score: 1
Jan 25 at 12:43 history asked Niclas CC BY-SA 4.0