Q
To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken_______________?
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A
A. From a source which is not the same as the unknown voltage
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B
B. From a battery
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C
C. From the same source as the unknown voltage
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D
D. Any of the above
Correct Answer:
C. C. From the same source as the unknown voltage