The plates of a spherical capacitor have radii 35.7 mm and 37.8 mm. (a) Calculate the capacitance. (b) What must be the plate area of a parallel-plate capacitor with the same plate separation and capacitance?

A parallel plate, air filled capacitor, has plates of area 0.61 m2 and a separation of 0.1 mm.What is its capacitance? (Units: nF=10-9F)

An air-filled capacitor is made from two flat parallel plates 1.3 mm apart. The inside area of each plate is 7.6 cm². (a) What is the capacitance of this set of plates (in pF)? pF (b) If the region between the plates is filled with a material whose dielectric constant is 6.2, what is the new capacitance (in pF)? pF