Explain how a capacitor stores charges

A charged capacitor stores energy in the electrical field between its plates. As the capacitor is being charged, the electrical field builds up. When a charged capacitor is disconnected from a battery, its energy remains in the field in the space between its plates.

Explanation:

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Step-by-step explanation:

Given:

Taking the partial derivative of the above equation with respect to z, we get

Collecting all terms containing we get

Then