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Both in classical (non-relativistic) electromagnetism and in relativity the equation of motion of an electron in electromagnetic field is$$ frac{dmathbb{p}}{dt}= e(mathbb{E}+frac{mathbb{v}}{c}times mathbb{B}).$$The momentum $mathbb{p}$ in the...
Asked on 02/21/2021
1 answerOne of my books and some of my friends say that torque and other angular quantities depend upon the perpendicular distance from the axis of rotation. This, in effect, would...
Asked on 02/21/2021 by ThePixelGenome
2 answerI have seen two statements of Einstein's 1905 light speed postulate; for instance, in Andrew Steane's Relativity Made Relatively Easy:There is a finite maximum speed for signals.There is an inertial...
Asked on 02/21/2021 by Nik
2 answerI'm trying to derive a classical model to describe diamagnetism, I'd like to understand if it is possible to understand the basic properties of diamagnetic materials with it i.e.: ''A...
Asked on 02/21/2021 by gioretikto
1 answerSuppose I have the momentum-space eigenstates of a system $psi_n(p)$. I write the time-evolved momentum states as $Psi(p,t) = sum c_npsi_n(p)e^{-i E_n t}$ where $E_n$ are the...
Asked on 02/20/2021 by Lelouch
0 answerSuppose I have a system (e.g., a particle) and I have different physical measurement apparatus which can act on it. Each of the measurement apparatus (observables) has 2 distinct labeled...
Asked on 02/20/2021 by MichaelChen
0 answerElectrons have both magnetic dipole moments and charge. Two electrons separated by a distance would repel electrically but it stands to reason they would rotate their spins so their magnetic...
Asked on 02/20/2021
1 answerThis question has been somewhat pre-empted by a report of its synthesis! They say "green energy storage material" (not quite verbatim) ... yeah - & superpowerful explosive as well -...
Asked on 02/20/2021 by AmbretteOrrisey
1 answerSuppose a fluid passes from having laminar flow, to having a turbulent flow (like when passing after an object). How do fluid speed and fluid density change after that? ...
Asked on 02/20/2021 by Domenico Bagnato
1 answerIt is said that nothing escapes from black holes, not even light. All particles are now thought to be excitation of different fields (electric field, electromagnetic field, photon field, etc)....
Asked on 02/20/2021 by Roy Closa
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