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Electric field between two metal plates
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[QUOTE="Philethan, post: 4995115, member: 540725"] 1. For (a), you assume the electric field inside the plate is zero, and that's different in non-conductor case. 2. For (a), you assume the electric field outside the plate is perpendicular to the surface of metal plate, that's also different in non-conductor case. I'm not sure why you think the left surface of the positive plate will have a negative charge in conductor case. But I think if there's still a negative charge in positive plate, then that means the positive plate is not in equilibrium state: static electricity equilibrium. Suppose that there's a conductor and has positive charge on the one side and negative charge in the other side. Then, there must be some electric lines between the positive and negative charges( just like what you said). That means, those "hidden free electron" will be influenced by the electric field inside the conductor and starts moving until the electric field inside the conductor is zero, i.e. it's in static electricity equilibrium. [/QUOTE]
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Electric field between two metal plates
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