Question

Explain determination of emf of the cell by potentiometer

Answer 1

Answer:

POTENTIOMETER HAS A WIRE OF SPECIFIC LENGTH WHICH HAS POTENTIAL GRADIENT. THE POINT AT WHICH DEFLECTION IN GALVANOMETER IS ZERO THAT WILL BE THE E.M.F OF SECONDARY CELL ATTACHED TO IT...

Explanation:

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.