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Two parallel palate capacitors X and Y ...

Two parallel palate capacitors `X` and `Y` have the same area of plates and same separation between then. `X` has air between the plates and `Y` contains a dielectric medium of `in_(r) = 4,`
Calculate (i) capacitance of `X` and `Y` if equivalent capacitance fo combination is `4 mu F`. (ii) potential diff between the plates of `X` and `Y`. (iii) What is the ratio of electrostatic energy stored in `X` and `Y` ?

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