Five air-filled parallel-plate capacitors have the plate areas and plate separations listed below, where A and d are constants. The capacitors are each connected to the same potential difference. Which capacitor stores the greatest amount of energy? a.
Area: 2A
Separation : d/2
b.
Area: 2A
Separation : 2d
c.
Area: A
Separation : d
d.
Area: A/2
Separation : d/2
e.
Area: A/2
Separation : 2d

The answer is "Option A"

Explanation:

Energy stored in capcitor

For point A:

For point B:

For point C:

For point D:

For point E:  

therefore C_A has the maximum capacitance and max energy same energy is dir proportional to C for the same J

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