A parallel-plate capacitor has plate area 200 cm2 and plate separation 3 mm. The charge density is

Question:

A parallel-plate capacitor has plate area 200 cm2 and plate separation 3 mm. The charge density is 1μC/m2 with air as dielectric. Find
(a) The capacitance of the capacitor
(b) The voltage between the plates
(c) The force with which the plates attract each other