A) potential gradients
B) a condition of no current flow through the Galvanometer
C) a combination of cells, galvanometer and resistances
D) cells
Correct Answer: B
Solution :
A potentiometer is an accurate and versatile device to make electrical measurements of EMF because the method involves a condition of no current flow through the galvanometer. It can be used to measure potential difference, internal resistance of a cell and compare EMF's of two sources.
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