Explanation:

A phase shift network is a type of electronic circuit that is used to shift the phase of an input signal. It is commonly used in applications such as audio amplifiers, oscillators, and filters. The phase shift network consists of passive components such as resistors, capacitors, and inductors.

Phase Shift:
Phase shift is a measure of the delay between a signal's input and output. It is typically measured in degrees and represents the difference in phase between the input and output signals. A phase shift of 0 degrees means there is no delay, while a phase shift of 180 degrees means there is a complete delay.

Phase Shift Network:
A phase shift network is designed to introduce a specific phase shift to the input signal. The amount of phase shift introduced by the network depends on the frequency of the input signal and the values of the passive components in the network.

Answer:
In the given question, the phase shift network will produce a phase shift of 180 degrees at one frequency. This means that for a specific frequency, the output signal will be delayed by 180 degrees compared to the input signal.

Explanation:
- A phase shift network can be designed to produce a specific phase shift at a particular frequency by selecting appropriate values of passive components.
- For example, a simple RC (Resistor-Capacitor) phase shift network can be used to produce a phase shift of 180 degrees at a specific frequency.
- The phase shift introduced by the network depends on the reactance of the passive components at the input frequency.
- At the specific frequency, the reactance of the passive components in the network will be equal and opposite, resulting in a phase shift of 180 degrees.
- However, at other frequencies, the reactance values will be different, and the phase shift introduced by the network will be different.
- Therefore, the phase shift network will produce a phase shift of 180 degrees at one frequency, but the phase shift will be different at other frequencies.
- Hence, the correct answer is option 'B' - the phase shift network will produce a phase shift of 180 degrees at one frequency.