Parallel plate capacitor

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Homework Statement




A Parallel Plate Capacitor connected to a 12 V source is charged to 21 micro coulomb. If the capacitor is filled with an oil of dielectric constant 3, then the charge stored is ---

Homework Equations





The Attempt at a Solution


C = q / V, substituting the values i got 1.75 micro farad. Now from the equation Cdielec/ Cair= epsilonr i now got 5.25 micro farad.
Again Cdielec = q /V, i cross multiplied 12 volt with 5.25 micro farad and got the answer 63 micro coulomb as the answer. But the answer as given in the book is 57 micro coulomb. Is there any mistake in my steps? Please help

Homework Statement





Homework Equations





The Attempt at a Solution


Homework Statement





Homework Equations





The Attempt at a Solution

 

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