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Mar
7
awarded  Yearling
Mar
6
comment Capacitance of Nested Spheres
@ Umut E. Usturah: OK, I think I understand.
Mar
6
accepted Capacitance of Nested Spheres
Mar
5
revised Capacitance of Nested Spheres
added 22 characters in body
Mar
5
comment Capacitance of Nested Spheres
@ Maxim Umansky Yes. By definition, if we are in static equilibrium what happens is that the arrangement of charge on the metal box must be so that it exactly cancels the field lines coming from my giant electron.
Mar
5
comment Capacitance of Nested Spheres
I can't understand your answer. The outer shell is a conductor. Hence anywhere inside the outer shell, the electric field must be 0.
Mar
5
asked Capacitance of Nested Spheres
Feb
28
comment Einstein's original papers predicting gravitational waves?
Isn't it true that Einstein didn't predict gravitational waves, but argued with Rosen that they don't exist?
Feb
19
revised Transformation of coordinates in relativity
deleted 19 characters in body
Feb
19
revised Transformation of coordinates in relativity
edited title
Feb
19
revised Transformation of coordinates in relativity
edited tags
Feb
19
asked Transformation of coordinates in relativity
Feb
3
awarded  Notable Question
Nov
16
awarded  Peer Pressure
Nov
3
accepted Why can't I push myself in a chair?
Nov
2
asked Why can't I push myself in a chair?
Nov
1
comment Photon-Photon-scattering (Feynman diagram)
OK, but shouldn't your integral go from 0, 1 not 0, 2? 2^3/3 = 8/3, not 1/3.
Aug
23
comment Showing that the magnetic field inside an infinite current carrying cylinder is zero
I know how to use Ampere's law to show this. I really wanted to follow the reasoning in the question. The point of the question is to figure it out without Ampere's Law. Also, your answer is not correct. My equation for B applies at all points except r = 0. According to your line of reasoning K in Coulomb's law would have to be zero or else the electric field of a single point particle would be infinite at r = 0. But that's wrong, because Coulomb's law is only valid for non-zero r.
Aug
23
accepted Showing that the magnetic field inside an infinite current carrying cylinder is zero
Aug
23
comment Showing that the magnetic field inside an infinite current carrying cylinder is zero
Let us continue this discussion in chat.