Question: Suppose a capacitor is fully charged by a battery and then disconnected from the battery. The positive plate has a charge (+q) and the negative

Suppose a capacitor is fully charged by a battery and then disconnected from the battery. The positive plate has a charge $+q$ and the negative plate has a charge $-q$. The plate area is doubled, and the plate separation is reduced to half its initial separation. What is the new charge on the negative plate?

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