capacitor

[lakshmi]

why does the potenial decrease in case of a capacitor

[aekanshchumber]

Please make the question little more clear, what potential are you talking about is it electric field potential or potential energy.

[roger]

Dear Lakshmi,

The Decrease In Voltage Over Time Is Due To Leakage, Ie Imperfections In Insulation.

<> Roger <>

[lakshmi]

it is the electrical potential decrease

[aekanshchumber]

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.