Describe the use of a potentiometer to compare the emf's of two cells by the direct method (i.e., connecting them separately).

How will you campare emf of two cells by potentiometer?

State the working principle of potentiometer. With the help of the circuit diagram, explain how a potentiometer is used to compare the emf's of two primay cells. Obtain the required expression used for comparing the emfs. Write two possible causes for one sided deflection in a potentiometer experiment.

The e.m.f. of two cells can be compared by

State the principle of potentiometer. Draw a circuit diagram used to compare the emfs of two primary cells. Write the formula used. How can the sensitivity of a potentiometer be increased.

The length of a potentiometer wire required to balance the e.m.f of cell (A) is 60cm. The length of the same wire under the same conditions required to balance the e.m.f of cell (B) is 45cm. If the e.m.f of cell (B) is 3.0 volts , the e.m.f of cell (A) is –

For a potentiometer to function, the emf of the cell ( E ) in the primary circuit compared to the emf of the cell ( E^(1) ) in the secondary circuit should have a realtion