State the working principle of potentiometer explain with the help of circuit diagram how the emf of two primary cells are compared by using the potentiometer.

State and explain principle of potentiometer.

How the emf of two cells are compared using potentiometer ?

With suitable circuit diagram, show how emfs of two cells can be compared using a potentiometer.

State the working principle of potentiometer explain with the help of circuit diagram how the potentiometer is used to determine the internal resistance of the given primary cell.

Draw a circuit diagram for the comparison of e.m.f. of two primary cells using a potentiometer.