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    Electrostatics: Capacitor

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    The plates of a parallel plate capacitor are 1 mm apart, each has an area of 1000 cm^2, and they are kept connected across a 600 V battery. Take the medium to be air (Ke = 1).

    (a) If the plates are moved apart until the separation is 2 mm, how much mechanical work is done and how much energy is returned to the battery?

    (b) Check the conservation of energy by also computing the change in the energy stored in the field between the plates.

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