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

It is required to measure the true open circuit e.m.f. of a battery.

1.	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.'potentiometer
D.	None of the above
Answer» D. None of the above

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

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