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Why are there clear-cut states of matter instead of a gradual transition from gas to solid (let's set plasma aside for the purpose of this question)? If the main difference...
Asked on 07/11/2021
1 answerYou know how an antenna works? It creates EM fields and oscilates them so that it creates electromagnetic fields...Well does that electromagnetic wave travel in a straight line or...
Asked on 07/11/2021
2 answerI'm working through section 15.1.3. of Di Francesco's CFT textbook. I don't understand the steps going between (15.42) and (15.43). They say to substitute$delta_omega J = sum_{b,c} i...
Asked on 07/11/2021 by Gaugegroup1996
0 answerSuppose that I have a small coil that is moved at a steady rate into a solenoid. The solenoid already has a current passing through (basically, it is an electromagnet)....
Asked on 07/11/2021 by Al Z.
1 answerI am trying to derive a Ward-type identity between amplitudes involving $barpsi sigma_{munu}gamma_5psi$, $bar psi gamma_mu gamma_5 psi$, and $bar psi gamma_5 psi$ in QCD (diagonal quark...
Asked on 07/11/2021
1 answerIn the course of my learning electromagnetism, I’ve noticed there are a striking amount of symmetries in electrostatics and magnetostatics, almost down to replacing divergence operators with curl operators. For...
Asked on 07/11/2021
1 answerSuppose we have a system of particles with positions $textbf{x}_k(t)$ and charges $e_k$. We define its charge density asbegin{equation}rho(textbf{x},t) = sum_k e_k delta^3(textbf{x}-textbf{x}_k(t))end{equation}And...
Asked on 07/11/2021
4 answerThe electric field outside a charged full infinite cylinder is (by Guass's law's integral form):$$E(r)=frac{rho R^2}{epsilon r}$$And the field induced by an infinite charged line:$$E(r)=frac{sigma}{2pi...
Asked on 07/11/2021 by Omer Paz
2 answerHow do I read these histograms because the interpretation seems ambiguous. https://profmattstrassler.com/articles-and-posts/the-higgs-particle/holiday-higgs-hints-confidence-inspiring-or-not/ Are they stacked or overlapping? So we established...
Asked on 07/11/2021
2 answerIn case of a home experiment about string vibration under the boundary condition$$y(l,t)=y(0,t)=0$$Where $y=$ the displacement of the string at spatial co-ordinate $x$ and at...
Asked on 07/11/2021
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