Question: A parallel-plate capacitor of area A and separation d is charged to a potential difference V and then disconnected from the charging source. The plates

A parallel-plate capacitor of area A and separation d is charged to a potential difference V and then disconnected from the charging source. The plates are then pulled apart until the separation is 2d. Find expressions in terms of A, d, and V for

(a) The new capacitance,

(b) The new potential difference, and

(d) How much work was required to change the plate separation from d to 2d?

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