Final answer:
Mica and disc capacitors are commonly used on circuit boards. They consist of conductive plates separated by a dielectric material to store and manage electric charge for various electronic applications.
Step-by-step explanation:
Mica and disc capacitors are components used in electronic devices to store electric charge. Among the options provided, they are typically used on C. Circuit boards. In their construction, a dielectric material is sandwiched between two conducting plates—such as metal foils—that remain neutral overall, but store charges +Q and -Q on opposite plates. This ability to store and release charge makes capacitors vital in various applications, from energy storage to filtering frequencies in radio reception.
Capacitors are not generally associated with electric motors, radio antennas, nor are they used directly along power lines in the way the question proposes. Instead, power capacitors, which can handle higher capacities, are used to balance the impedance of effective inductance in transmission lines according to Figure 15.14.