Question

Comparison of emf of two cells using potentiometer 2

Answer 1

✷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.

Answer 2

Answer:

Using a potentiometer, we can determine the emf of a cell by obtaining the balancing length l. Here, the fall of potential along the length l of the potentiometer wire is equal to the emf of the cell, as no current is being drawn from the cell. Then, or, ; where k is the potential gradient along the wire.

hope it helps you....