Question

what is the principle of potentiometer​

Answer 1

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The principle of the potentiometer is that: For a wire having uniform area of cross section and uniform composition,the potential drop is directly proportional to the length of wire. The above principle is valid when potentiometer is used in comparing the EMF of two cells.

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Answer 2

Answer:

The potentiometer works on the principle that when a constant current flows through a wire of uniform cross sectional area, potential difference between its two points is directly proportional to the length of the wire between the two points.