Final answer:
The statement that an axial lead capacitor is marked to indicate its negative plate is true. Axial lead capacitors have leads on opposite ends, and their proper installation is crucial for circuit functionality. Capacitors store charges on the surfaces of their plates, with the electrical field between them being directly related to the amount of charge.
Step-by-step explanation:
The statement that an axial lead capacitor is indicated by a black band or a negative sign (-) on one side to show its negative plate is true. This type of capacitor is designed with leads on opposite ends of its cylindrical body. For example, in an axial lead capacitor, the negative plate is marked with a black band, which is helpful in ensuring the correct polarity is used during installation in circuits, as reversing the polarity can cause damage to the capacitor and the larger electronic system.
It's also important to note that charges on a capacitor are stored on the surfaces of the capacitor plates, and the electrical field is established between these plates, with its magnitude being directly proportional to the charge stored.
Types of Capacitors
In a parallel plate capacitor, two identical parallel-conducting plates are separated by distance, and the electric field is proportional to the surface charge density on one plate. Rolled capacitors, on the other hand, involve a dielectric material between the plates. Each type of capacitor serves a specific function in regulating and storing charge within electronic circuits.