Q. It is required to measure the true open circuit e.m.f. of a battery. The best device is (Solved)
1. D.C. voltmeter
2. Ammeter and a known resistance
3. D.C. potentiometer
4. None of the above
- c. D.C. potentiometer
1. D.C. voltmeter
2. Ammeter and a known resistance
3. D.C. potentiometer
4. None of the above