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While studying the unit of electrostatics, I came across the formula $$C=dfrac QV,$$ Where C refers to the capacitance of the conductor, $Q$ refers to the charge present...
Asked on 07/01/2021
1 answerThe action is defined as $S = int_{t_1}^{t_2}L , dt$ where $L$ is Lagrangian. I know that using Euler-Lagrange equation, all sorts of formula can be derived, but...
Asked on 07/01/2021 by RRRR
6 answerI have found confusing definitions in various places regarding the stress-energy tensor, in particular when used to derive Einstein GR equations from the principle of stationary action.Some of these...
Asked on 07/01/2021 by Carla
1 answerSuppose an electron is moving through empty space at speed v. It produces an electric field because it is a charge. But this field changes as it moves. Changing...
Asked on 07/01/2021
3 answerA crystal at any finite temperature has phonons, as longer wavelength phonons require less energy to be excited. It seems that the electron (or cooper pair composite particle) wave would...
Asked on 07/01/2021
2 answerFollowing Hawking and Ellis,section 4.3, page 91, the dominant energy condition stipulates that for every timelike vector $W_a$, the energy-momentum tensor $T^{ab}$ satisfies the inequality $T^{ab}W_aW_bge 0$,...
Asked on 07/01/2021 by lewton
0 answerThe Pauli equation is the generalization of the Schrodinger equation to charged particles in an electromagnetic field. It is written in a very compact way with heavy...
Asked on 07/01/2021
0 answerWikipedia tells me that a bolt of lightning releases roughly 1 GJ of energy, but I'm guessing that's along the entire length of the bolt and that...
Asked on 07/01/2021 by Raymond Gulbrandsen
2 answerDifferent authors of books have given two different answers which one is more appropriate?Q-A parallel-plate capacitor is placed in such a way that its plates are horizontal and the lower...
Asked on 07/01/2021 by royboy
1 answerHow can we write the equations of a line of force between two charges, say $q$ and $q'$? As an example, you may consider the simpler case of two opposite...
Asked on 07/01/2021
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