Physics Current Electricity Level: Misc Level

A Parallel -plate capacitor has a plate area of 126 square centimeters and a plate separation of 0.58 mm, Half the area between the plates is filled with Teflon . The other half is filled with air. 

a.when 20 V is applied, the charge on this capacitor is ---

b. The maximum voltage that can be applied to the capacitor is --