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a parallel plate capacitor is fully charged by a battery, and then the battery is disconnected....

a parallel plate capacitor is fully charged by a battery, and then the battery is disconnected. if a dielectric material is then inserted between the capacitor plates, which of the following quantities would remain constant?
A) electric field between the plates
B) potential difference across the plates
C) charge on each plate
D) energy stored in capacitor
E) charge and energy would both remain constant
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