Recent content by SredniVashtar

I believe it not to be true in general. It might be true with the unphysical case of infinite plates but the amount of charge exchanged with earth should in general be geometry dependent. I asked an artificial helper to solve a problem with three charged spheres, the middle one of which to be...

The net charge of the system is not zero both before and after grounding the third plate. So I don't think you can assume the charge on the outermost surface has to be zero.

The idea was that a black wire was there, soldering was inappropriate, and it detached from the pad and fell inside the body during disassembly. I saw the black wire attached to the battery pack but did not see the black wire at the bottom of the PCB. The op should probe the circuit with a...

In your last photo there is a red wire attached to the BAT+ pad, but there is no wire attached to the BAT- wire. It might be needed.

1. It is more or less an electric dipole field that decreases with distance 2. It is the value of electric field allowed by the constitutive relation in the material of the wire, that is Ohm's law in its local form. It could be very high if the conductivity of the wire is low (compatible with...

My point is that the wave is the transient, and the static field we perceive after the transient has died out is... a static field. Not a wave.

Who ever said they are in an empty universe and they are free to recombine?

Ok, let's change the timescale: instead of 20 ns, let's make it 4 billion years. We sit in the middle of this event. Would you call that perturbation that has been static for 2 billion years minus the few microseconds or milliseconds during the initial transient a "wave"? I wouldn't . I call...

Are we still talking of classical electrodynamics? Because, to my knowledge, charges are the sources of the electric field, and currents are the sources of the magnetic field. They still are the sources (in the sense of the reason for the field presence - or if you prefer it "the nonzero value...

I am seeing this from the point of view of classical ED. Fields are an expression of the presence of a charge.

That seems just semantics. But ok, the perturbation in the field between creation and annihilation is say 100 ns long and, from a distance, I have 100 feet in space where the electric field is non zero, while it is zero before and after. In the middle I only have the static electric field of the...

In the case of creation and annihilation, we can see the field itself as a change from zero field to nonzero field and then back to zero field. The argument of the field being 'already everywhere' should not apply here because the charges responsible for it were not always there. If we create...

Not only the wave, but the electric field itself would come from the charges - far far away "when" they existed. The fields propagate at a finite speed, so when I sense them - say one year later - I know some charge far away must have generated them. Then after say ten minutes, those...

What about the creation and subsequent annihilation of charge and anti charge? No electric field before the creation of the pair, a field due to the opposite charges separating - possibly with EM wave due to the acceleration - and then no more field when they annihilate. After the annihilation...

I have played around with Falstad's simulations and it seems there's a problem with the toroidal solenoid. It seems it shows the A lines instead of the B lines...