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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![Two identical charges situated 20cm apart in vacuum repel each other with a force of 1.0N. Calculate the value of each other with a force of 1.0N. Calculate the value of each charge. [(14 πεo)‾¹ = 9 x 10^9 Nm²C‾²]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "Two identical charges situated 20cm apart in vacuum repel each other with a force of 1.0N. Calculate the value of each other with a force of 1.0N. Calculate the value of each charge. [(14 πεo)‾¹ = 9 x 10^9 Nm²C‾²]")