why does the potenial decrease in case of a capacitor
Please make the question little more clear, what potential are you talking about is it electric field potential or potential energy.
The Decrease In Voltage Over Time Is Due To Leakage, Ie Imperfections In Insulation.
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it is the electrical potential decrease
Let a parallel plate capacitor, Both plates are connected to diffrent terminals of a battery. On the plate connected with the positive side of the battery there is a positive charge and voltage V(+) similerly on the other plate there is a negative charge and voltage V(-).
As one move from the one of the plate to other there will be change in voltage, usually charge is assumed to move from positive to negative side, Voltage is decreased.
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