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Two metallic circular plates each of rad...

Two metallic circular plates each of radius r placed coaxially at a distance d apart and with its capacitance 400 `mu`F (d `<``<` r). If a circular plate of half the radius and thickness 'd' of relative permittivity `epsilon` is placed coaxially between the plates of the capacitor then its new capacitance is 10x `mu`F. Fill 'x' in your answer sheet.

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