Why is the galvanometer not used in AC bridges?

Hint: In this question, we need to explain the reason why galvanometer is not used in AC bridges. A galvanometer is an instrument that detects a small amount of current or a function of current by deflecting a moving coil.

Complete step by step solution:
We know that AC bridges are often used to measure unknown resistance, inductance, as well as capacitance values. Despite this, AC bridges are thought to be very useful and also provide precise measuring results.

So, we can say that a moving coil galvanometer cannot trace alternating current in a circuit because it measures the mean value of current, and the mean result of alternating current over just a full cycle is zero. Hence, due to this reason, the galvanometer is not used in the AC bridge.

Therefore, the galvanometer is not used in AC bridges.

Additional information: There are different applications of galvanometers in our daily life such as
1. The galvanometer is also used to evaluate the voltage between any two points just on the circuit.
2. It detects the orientation of current flows in the circuit. It also helps to determine the circuit's null point. The scenario in which no current flows through the circuit is referred to as the null point.
3. It is useful for measuring electric current.

Note: A galvanometer is an instrument used to determine (but does not measure) the flow of Direct Current (DC). This is because the galvanometer's needle tries to move in the same path as the current. This is only viable with direct current.