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In Reply to: RE: Farraday Cage? posted by Maxamillion on December 13, 2015 at 19:05:35
Max, I think the situation where you have, say, a charged ball and connect to ground, then electrons can move from the ball to earth. (This basically happens because the ball is charged with respect to earth).
But in a charged capacitor, whether a battery is connected or not, the situation is different. The negative pole of the capacitor has an excess of electrons, sure, but they are being held there by the 'positive charge' (to simplify things) on the other plate. In other words, a charged cap, connected to nothing (or a battery) is in equilibrium.
If you connect the - to earth then nothing will flow into the earth - if any current (ie electrons) *did* flow then this would disturb the equilibrium on the cap, which would immediately suck the electrons back to the plate. (Which is precisely why they won't flow).
Follow Ups:
Good points and I believe I did mention the effect of the positive plate in pulling the charge back, somewhere in this thread. Perhaps, though, just disturbing the equilibrium temporarily is enough. Remember that the ground is part of the AC (music) circuit, and the music signal is continually "disturbing the equilibrium". Could it be that the disturbance of the equilibrium with the 9V of potential pulling it back to equilibrium is what we perceive as enhanced dynamics? In other words a dynamic resonance effect?
Edits: 12/14/15
No, as I explained, there is no reason for the equilibrium to be disturbed so it won't be.
A fluctuating AC voltage connected to the negative plate is certainly a reason for equilibrium to be disturbed. Equilibrium is simply a mental construct to represent the time-averaged behavior; in reality things are much more dynamic than that.
https://en.wikipedia.org/wiki/List_of_types_of_equilibrium
I don't see equilibrium as merely a mental construct - it has clear meaning in physics. And this thread started out being about the physics.
So, I disagree, but won't argue any more.
Rather at best it achieves steady state conditions, as there is always a leakage current flowing. Steady state is only steady until the system changes in some way. Connecting a fluctuating audio ground qualifies as a change to the system, no?
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