A. Voltmeter
B. Meter rule
C. Galvanometer
D. Potentiometer
Correct Answer:
Option D – Potentiometer
Explanation
Voltmeter: An instrument for measuring electric potential in volts
Galvanometer: it is a device used to indicate the 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
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