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. potentiometer
4. none of the above
- c. d.c. potentiometer
1. d.c. voltmeter
2. ammeter and a known resistance
3. d. potentiometer
4. none of the above