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

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1.	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
Answer» B. Add a half wave rectifier in the feedback loop

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