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To measure an A.C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken | |
A. | from a source which is not the same as the unknown voltage [Wrong Answer] |
B. | from a battery [Wrong Answer] |
C. | from the same source as the unknown voltage [Correct Answer] |
D. | any of the above [Wrong Answer] |