Question

Two cells of emfs 5v and 10v are to be accurately compared

Answer 1

Explanation:

The potential drop along the wires of potentiometer should be greater than emfs of cells.

In a potentiometer experiment, the emf of a cell can be measured if the potential drop along the potentiometer wire is more than the emf of the cell to be determined. Here, values of emfs of two cells are given as 5 V and 10 V, therefore, the potential drop along the potentiometer wire must be more than 10 V.