Answer :
Energy stored in a capacitor U = q²/2C
What is capacitor?
In an electric field, a capacitor is a device that stores electrical energy. It has two terminals and is a passive electrical component. Capacitance refers to a capacitor's effect. a capacitor is an electrical energy storage device that consists of two conductors that are isolated from one another and placed near to one another. A straightforward illustration of one such storage device is a parallel-plate capacitor.
Energy stored in a capacitor U = q²/2C
charge on the capacitor is one half q = q/2
U1 = q²/8C
U1 = q²/8C = U/4
Energy stored in capacitor is one-quarter of the total energy.
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