Why can a galvanometer not be used in an AC bridge?
An electric quantity that represents the rate of variation of electric charge with time is known as electric current. Its measurable unit is Ampere. Due to the movement of electric charge, the electric current produces.
Answer and Explanation:
The galvanometer is a device that used to measures the average current move for the coil and an ac source, the average current move for half cycle is positive, and another half cycle of current passes is in negative sign. Overall, the average current in one complete cycle becomes zero. So it does not show any deflection and the only vibration of the needle seen.
That is the reason galvanometer cannot be used in an AC bridge.
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Learn more about this topic:
from Physics: High SchoolChapter 16 / Lesson 2