Question

How will you determine the rate of emf of two primary cells using potentiometer?

Answer 1

Answer:

you can obtain the ratio of EMF of two primary cells by connecting them one at a time in potentiometre and obtaining their balancing length and since it is known that EMF is directly proportional to balancing length you need to divide balancing length of. primary cells to get ratio of their respective EMF

(EMF of cell =kL

where k is potential gradient and L is balancing length)