5

They do indeed repel each other. But they are repelled from the point they are coming from even stronger. Imagine having two charged metal balls where one has half the charge of the other. When you connect them with a wire, will charges flow? Yes. Sure, each individual electron feels a strong repulsion from both of the balls, since there already is an ...


4

Electrons do repel each other but they also like to spread out. Quantum mechanics tells us that it costs a lot of energy to localize an electron in a small volume. These two tendencies compete. The quantum mechanical Hubbard model is based on these two effects. It has two parameters: on-site repulsion and transfer energy (transfer Hamiltonian matrix element)....


3

The drag is due to repulsion caused by eddy currents induced by the moving magnetic field in the Aluminum metal. The repulsive force opposes the motion of the metal ball according to Faraday's second law of electromagnetism. The same thing will happen if you replace the aluminum with copper metal.


1

when a surge of electrons moves through the wire to one plate of the capacitor, the electrons on the other plate "see" those electrons across the gap between the plates and are repelled by them- so there is a temporary surge of electrons "fleeing" out of the second plate. As soon as the first plate has become fully occupied with extra ...


1

Surface charge 'density' will not be Q. It will be $\sigma=\frac{3Q}{4\pi R^3}$. Yes in a conductive sphere the charges will move towards the surface, ideally speaking the volume charge density will be 0 as a result.


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