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Unformatted text preview: o , where Q is the total charge, σ=Q/A is the areal density over area A of each plate. The most important conclusion here is that F does not involve the distance between the plates. The force is the same, given the charge and the area and does not change when the plates are pulled apart. This is true only if the charge on each plate remains the same i.e. the plates are not connected to a battery. If the plates are connected to a battery, then the potential difference remains (held to be) the same but the amount of charge on each plate changes. There is a simple calculation to show that if the distance between the plates is doubled, while connected to a battery, the force on one plate exerted by the other is reduced by a factor of four. The force varies as a square of the distance between the plates. 18 9 2 1 2 1 = = + C C C C 3....
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