A pi filter consists of what configuration of components?

A pi filter employs a configuration that consists of an inductor with a capacitor at each end, resembling the Greek letter "pi" (π) in its layout. This configuration is particularly effective for voltage smoothing and frequency filtering in power supply circuits.

The inductor acts to block high-frequency signals while allowing low-frequency signals to pass, essentially serving as a choke. The capacitors, placed at both the input and output sides of the inductor, help to shunt high-frequency noise to ground, thereby reducing ripple voltage and improving the stability of the DC output. This arrangement enhances the filter's overall performance in terms of frequency response and ripple rejection, making it a preferred choice in various electronic applications where clean and stable DC power is crucial.

In contrast, the other configurations do not provide the same level of filtering efficiency or performance required in applications where a pi filter is typically utilized. Consequently, the distinct arrangement and function of the components in option B is what ensures the pi filter effectively fulfills its role in power supply and signal processing circuits.