An air-filled parallel-plate capacitor is constructed with a plate area of 0.40 m2 and a plate separation of 0.10 mm. It is then charged to a potential difference of 12 V? (ε0 = 8.85 × 10-12 C2 /N ∙ m2 ) (a) How much charge is stored on each of its plates? (b) If the capacitor is then filled with a glass dielectric (K = 5.0), by how much does the charge if it changes at all? The capacitor is not connected to a battery.

The charge stored  is  

The energy stored is  

Explanation:

From the question we are told that

    The area of the plates is  

     The separation between the plate is

      The potential difference is  

       The permitivity of free space is  

         The dielectric constant of glass is K =  5.0

Generally the capacitance of this capacitor is

substituting values

The charge stored is mathematically evaluated as

substituting values

The energy stored is  

substituting values

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