Effect Of Dielectric Medium On Capacitance

What is the effect of presence of a dielectric medium on (i) capacitance of a parallel plate capacitor (ii) electrostatic force between two charges ?

The capacitance of a parallel plate capacitor with air as Medium is 6 muF . With the introduction of a dielectric medium,the capacitance becomes 30muF . The permittivity of the medium is:

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Effect Of Dielectric On Different Parameter

In the figure, a capacitor is field with dielectrics. The resultant capacitance is

In the figure a capacitor id filled with dielectric. The resultant capacitance is