Consider a parallel-plate capacitor constructed from two circular metal plates of radius R. The plates are separated by a distance of 1.5 mm.
(a) What radius must the plates have if the capacitance of this capacitor is to be 2.6 µF?
(b) If the separation between the plates is decreased, should the radius of the plates be increased or decreased to maintain a capacitance of 2.6 µF
(c) Find the radius of the plates that gives a capacitance of 2.6 µF for a plate separation of 3.0 mm.
(d) If the space between the plates of the capapcitor is now filled with mica, what will be the new capacitance?