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Three large identical conducting plates ...

Three large identical conducting plates are placed at a distance d in air. The space between the first two plates is filled completely with dielectric of dielectric constant 2 as shown. The plates are given charges 7Q,3Q and 2Q respectively. The outer plates are connected by good conducting wire through switch .S.. When .S. is closed, the charge that flows through switch is nQ Find the value of n?

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