Skip to main content
17 events
when toggle format what by license comment
Oct 18, 2018 at 8:59 history edited Qmechanic CC BY-SA 4.0
added 84 characters in body; edited tags
Jan 16, 2014 at 1:23 answer added wonderich timeline score: 10
Jan 15, 2014 at 22:42 history protected Qmechanic
Jan 15, 2014 at 22:26 answer added Srr timeline score: 1
Jun 25, 2013 at 14:15 answer added Janek_Kozicki timeline score: 12
Nov 17, 2012 at 13:38 answer added Emilio Pisanty timeline score: 19
Nov 17, 2012 at 13:01 history tweeted twitter.com/#!/StackPhysics/status/269787558727266305
Nov 17, 2012 at 13:01 comment added Dani Spherical symmetry is not incorporated in Maxwell's equation. To go from Gauss' law to Coulomb's law for point-like particles which produces a spherical symmetric electric field in the space this assumption has to be made. In addition, Maxwell's equations do not tell you that there is no magnetic field, they just tell you that there are no magnetic monopoles (Gauss' law again). Electric and magnetic fields are two sides of the same field: electromagnetic field.
Nov 17, 2012 at 12:52 comment added achatrch @Daniel Blay: I guess when you say usual tricks you mean taking a spherical surface around the point charge. The problem for me is that how do we know that the magnitude of the electric field from a point charge is spherically-symmetric. Besides how can we derive that there is no magnetic field (if it is possible to derive from Maxwell's equations)? :)
Nov 17, 2012 at 12:45 comment added achatrch @DanilH: I meant 8 scalar equations. From the 4 Maxwell's equations two are vector equations.
Nov 17, 2012 at 12:35 comment added Dani Why 8 Maxwell's equations and not 4? I am missing something?
Nov 17, 2012 at 12:31 comment added Daniel Blay Wouldn't it be trivial to apply the divergence theorem to Gauss' law to get it in its integral form. From here it seems easy enough to use the usual tricks to find the electric field of a point charge, and then multiply by some charge to get your force. Surely this is Coulomb's force law?
Nov 17, 2012 at 11:54 comment added achatrch Yes, I have already read this post, but my question is quite different.
Nov 17, 2012 at 11:28 history edited Qmechanic CC BY-SA 3.0
added 5 characters in body; edited title
Nov 17, 2012 at 11:27 comment added Qmechanic For essentially the opposite question(v3), see this Phys.SE post.
Nov 17, 2012 at 11:25 history edited Waffle's Crazy Peanut CC BY-SA 3.0
deleted 12 characters in body
Nov 17, 2012 at 11:19 history asked achatrch CC BY-SA 3.0