Question

explain principle of pktentiometer and write expression for the ratio of emfs of two primary cell using potentiometer

Answer 1

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. Potentiometer is a device used to compare the e.m.f. ... 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.

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Answer 2

principle of potentiometer : When a constant current flows through a wire of uniform area of cross section , the potential drop across any length of the wire is directly proportional to the length.

If L is the balancing length of the cell of emf E, then E= kL.

if L1 and L2 are the balancing length of two cells of emf  E1 and E2 for the same potential gradient then ,

E1/E2= L1/L2