What is the typical characteristic impedance of a standard coaxial cable used in RF applications?

The typical characteristic impedance of standard coaxial cables used in RF (radio frequency) applications is either 50 ohms or 75 ohms, and the choice between these values typically depends on the specific application.

In RF communication, a 50-ohm coaxial cable is commonly used for transmitting RF signals, such as in antennas and transmitters, because it offers a good balance between power handling capacity and signal loss. This impedance is especially prevalent in amateur radio, broadcast, and certain telecommunications applications.

On the other hand, 75-ohm coaxial cables are primarily used in applications requiring lower signal loss, such as cable television systems and some broadband communication systems. The design of 75-ohm cable allows it to effectively minimize reflections and loss, making it well-suited for receiving signals.

Thus, understanding the distinction and applications of these characteristic impedances helps in selecting the correct cable for RF applications, making choice B the most accurate answer.