JustJoe Posted December 14, 2022 Author Share Posted December 14, 2022 (edited) 12 minutes ago, joigus said: The actual reason why electricity cannot be "grounded" --or, if you will, there is no similar principle for gravity, as there is for electricity, as "grounding of a distribution of charges and currents"-- is that electricity is polar, while gravity is not. Charges can be positive or negative, while mass is always positive and the interaction is always attractive. Positive distributions of charge have a natural place to set the zero for the potential: Spatial infinity. Negative distributions of charge have a natural place to set the zero for the potential: Spatial infinity. Distributions of mass have a natural place to set the zero for the potential: Spatial infinity. This is because, far enough away from the distribution of either charge or mass, the field always "looks" monopolar- except for radiation. You can see this from a totally general multipolar expansion of the electrostatic field. Gravity, as we know, is described by GR, but the pre-relativistic approach is enough for the purposes of this discussion. If anything, consideration of GR would make the analogy even more implausible. For electric charge, actually, there are deep principles of physics that tell us that far enough away from the distribution of charge, the monopolar term must go to zero. This is not exactly equivalent to what a recent poster said that "total charge must be zero," or something to that effect. It just means that, at large enough distances, charges will screen each other so as to make the electrostatic field go down at large enough distances. IOW: You just cannot take excess positives to one region and excess negatives to another at arbitrarily large distances. The Earth is a relatively good conductor and can take as many excess electrons as regular physical processes near its surface can produce without subtantially changing its global electric charge --which is zero. So you can set its electrostatic potential to V=0, while keeping consistent with V=0 at spatial infinity You cannot do that with gravity... The upshot --if nothing else was understandable-- is: Gravity cannot be cancelled. I've read before that lightning can be a positive or a negative charge and the charge that comes from the ground to connect with the lightning is the opposite charge ? When we rub a balloon and create an electrostatic charge , the balloon can be stuck to a vertical wall , the static energy being grounded by the wall . An atom has an electron and a proton , these both have opposite charges . Why are the Coulombs of force ignored by science just because they measure 0 voltage ? A force isn't a voltage . Edited December 14, 2022 by JustJoe Link to comment Share on other sites More sharing options...
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