Q. How to modify a low voltage DC voltmeter to low voltage ac voltmeter

A
Add a full wave rectifier in the feedback loop
B
Add a half wave rectifier in the feedback loop
C
Add a square wave rectifier in the feedback loop
D
Add a sine wave rectifier in the feedback loop
Solution:

A combination of an ammeter and a full wave rectifier can be employed in the feedback loop to form an ac voltmeter.

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