Which of the following instrument is most accurately for ...
Which of the following instrument is most accurately for comparing electromotive force (e.m.f) of two cells?
Voltmeter
Meter rule
Galvanometer
Potentiometer
Correct answer is D
Voltmeter: an instrument for measuring electric potential in volts
Galvanometer: it is a device used to indicate direction of a small electric current
Potentiometer: is a device for measuring or comparing e.m.fs of cells
Meter rule: measuring a distance at different points