State the principle of potentiometer.

State the principle of a potentiometer.

Explain the principle of a potentiometer. How will you compare the e.m.f. of two primary cells by using potentiometer? Explain with proper circuit diagram.

According to the principle of potentiometer, the emf of the cell is:

What is the principle of a potentiometer? With the help pf circuit diagram, explain the use of potentiometer to measure internal resistance of a given primary cell.