John McVirgo

1,674 reputation

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	1,674 reputation	bio	website		visits	member for	2 years, 4 months
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Apr 30	comment	What do I see if I move quickly past a charge surrounded by iron filings? I don't think it's realistic to ignore the electric polarization of the iron filings by the electric field of the charge. This will cause the iron filings and charge to attract one another in their rest frame.
Apr 28	comment	Proving the consistency of Faraday's law of electromagnetic induction @Oaoa typo fixed, thanks
Apr 28	revised	Proving the consistency of Faraday's law of electromagnetic induction fixed missing d/dt
Jan 16	comment	No magnetic field from a static charge - Is there a simple physical argument to show why? @MarkEichenlaub you're right that it doesn't really need the preamble. But I thought it worth putting in to emphasise that the conservation of relativistic energy partly explains the form of the electric Lorentz force created by a static electric change, and perhaps give a clue to the additional physical argument that is needed to show why it mustn't create a magnetic field.
Jan 16	awarded	Yearling
Jan 16	revised	No magnetic field from a static charge - Is there a simple physical argument to show why? improved wording
Jan 15	asked	No magnetic field from a static charge - Is there a simple physical argument to show why?
Jan 9	comment	The Four-Clock Special Relativity Conundrum Could you add an explaination for your notation?
Dec 25	comment	The Four-Clock Special Relativity Conundrum @TerryBollinger Thanks. Unfortunately there was a typo in the labelling of the times which no one mentioned, that I've now fixed.
Dec 25	revised	The Four-Clock Special Relativity Conundrum typo
Dec 23	answered	The Four-Clock Special Relativity Conundrum
Dec 4	awarded	Constituent
Nov 26	awarded	Caucus
Nov 16	comment	Derive $\frac{\mathrm{d}}{\mathrm{d}t}(\gamma m\mathbf{v}) = e\mathbf{E}$ from elementary principles? But now you need to derive the Hamiltonian from elementary principles to answer my question. Still +1 since your answer is very close to my conclusion given the Hamiltonian is the total energy: The Lorentz force law for a static electric field expresses the conservation of energy, with the change in field energy depending only on the change in postion of the charge.
Nov 10	comment	Is it possible to recover the old Bohr-Sommerfeld model from the QM description of the atom by turning off some parameters? @RonMaimon and lubos, maybe you're both right? Isn't the Bohr-Sommerfield model to QM what CED is to QED?
Nov 9	comment	What was Albert Einstein's proof for $E=mc^2$? A more recent proof by Terence Tao terrytao.wordpress.com/tag/mass-energy-equivalence
Nov 9	answered	Proving the consistency of Faraday's law of electromagnetic induction
Nov 6	comment	What are the challenges to achieving cold fusion? @ron "Pons/Fleisch" you really think so? Don't you think funding of their lab might have had something to do with what they saw?
Nov 2	comment	How to publish scientific papers on the internet for free? post them on vixra.org
Nov 1	comment	Why do we use Root Mean Square (RMS) values when talking about AC voltage @JohnRennie because it's a "grubby" engineering question, as Gell-Mann would say.