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    Parallel plate capacitor

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    A parallel-plate capacitor is connected to a battery that maintains potential difference V between the plates. If the plates of the capacitor are pulled farther apart, do the following quantities increase, decrease, or remain the same?

    (a) Electric field between the plates;
    (b) charge on the plates;
    (c) capacitance;
    (d) energy stored in the capacitor.

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    Solution Preview

    In all these cases the battery is maintaining a constant voltage V. Increasing d decreases the capacitance as C = epsilon o A/d and epsilon o and A remain the same while d increases.

    (a) Electric field between the plates ...

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