Recent content by bakshi

I just read this from Wikipedia: Incandescence occurs in light bulbs, because the filament resists electron flow. This excites electrons in the filament material to jump to a higher atomic orbital and thus subsequently release a photon when they fall back to their original orbits. Depending...

Thank you Erickalle for clarifying my point. This is exactly what my question was. A "symmetric" problem would arise if the surface delimited by the Amperian loop was between the plates of the capacitor, but didn't contain a whole plate (I would need a figure here...). Then, there would...

Maybe my question wasn't clear enough. I do know that the displacement current is not a real current but just a changing electric flux through a surface. Let me try to formulate my question again. Let's suppose that our Amperian loop is centered around the wire leading to one of the charging...

The example of the charging capacitor is often used to show that Ampère's law cannot work in electrodynamics, since the value of the integral (I'm talking about Ampère in integral form here) would depend on the choice of surface delimited by the Amperian loop. It is then shown that since the...

I found the answer to my own question. You can choose any gauge you want for the potentials: no matter what the speed of the collecting sphere (which is even infinite for the scalar potential in the Coulomb gauge), they will all lead to the same equations for the fields, and these equations are...

Choosing the Lorenz gauge implies that sources of the EM potentials at a given point are the charge density (for scalar potential) and current density (for vector potential) that cross a collecting sphere converging at the speed of light toward that point. It is often said that the retarded...

Suppose you have a 9 V battery that you connect to a load having a very low resistance (e.g. 0.1 ohm). From Ohm's law, the current would be I = V/R = 90 amps, which seems impossible to obtain from such a battery. If we suppose that the load will not burn, which of these options is the correct...

If we treat each atom in the medium as a harmonic oscillator, then it can be shown that the position of an electron within that atom will vary in phase with the electric field. It can also be shown that a plane of charges that are moving together produces an electric field equal to a constant...

The fact that light has a smaller apparent speed in a transparent medium can be explained classically by considering the motion of the electrons of the medium in the oscillating (radiation) electric field produced by the source. Because they accelerate, these electrons emit an electric field...

Hi, The mass of a bound system of quarks (e.g. proton) is larger than the mass of its constituents. You could say this is because the mass of the system corresponds to the energy in the color field, which is larger when the quarks are closer (even if the force is weaker then). For a bound...