MCQ
In a potentiometer arrangement. $E_1$ is the cell establishing current in primary circuit. $E_2$ is the cell to be measured. $AB$ is the potentiometer wire and $G$ is a galvanometer. Which of the following are the essential condition for balance to be obtained.
- AThe $\mathrm{emf}$ of $E_1$ must be greater than the $\mathrm{emf}$ of $E_2.$
- BEither the positive terminals of both $E_1$ and $E_2$ or the negative terminals of both $E_1$ and $E_2$ must be joined to one end of potentiometer wire.
- CThe positive terminals of $E_1$ and $E_2$ must be joined to one end of potentiometer wire.
- ✓Both $(A)$ and $(B)$
