A conducting sphere which is at an infinite distance from any other conductor has capacitance. It is, however, impossible to place a conducting sphere at an infinite distance from other conductors. Calculation reveals that it has a capacitance of 700uF. Capacitors in Series. Capacitors in Parallel. Types of Capacitor.
Mica capacitors are general purpose capacitors that are highly stable and have low dissipation.
They are not produced in high capacitance values, however, as the Mica is rather costly. Polycarbonate Polycarbonate capacitors are frequently manufactured in a miniature laminate fashion for PCB mounting. They are often self healing i.e. an overvoltage will cause a discharge between the plates that will evaporate the metal so leaving them intact. In fact they can be manufactured so that an overvoltage is deliberately applied during manufacture to guarantee a design voltage. They are suitable for timing applications or radio frequency circuits.