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  4. A thin metal plate P is inserted half way between the plates of a parallel plate capacitor of capacitance C in such a way that it is parallel to the two plates. The capacitance now becomes

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Q. A thin metal plate $P$ is inserted half way between the plates of a parallel plate capacitor of capacitance $C$ in such a way that it is parallel to the two plates. The capacitance now becomes

ManipalManipal 2019

Solution:

When a thin metal plate is placed between the plates of a parallel plate capacitor, then its capacitance increases so, out of the given choices, $4\, C$ will be the right answer.