Pulling apart a capacitor

Electricity and Magnetism Level 2

A parallel plate capacitor of capacitance \( 10 \ \mu \text{F}\) is charged to \( 50 \ \mu \text{C}\) using a battery, and is then disconnected from the circuit. How much energy (in microjoules) is required to pull apart the plates such that the distance \(d \) between them is doubled?

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