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It is required to measure the true open circuit e.m.f. of a battery. The best device is_____________?

/ Measurement and Instrumentation / By
It is required to measure the true open circuit e.m.f. of a battery. The best device is_____________?

A. D.C. voltmeter
B. Ammeter and a known resistance
C. D.C. potentiometer
D. None of the above