In a potentiometer arrangement,$E_1$ is the cell establishing the current in the 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 conditions for a balance point to be obtained?
- AThe $emf$ of $E_1$ must be greater than the $emf$ 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 the potentiometer wire.
- CThe positive terminals of $E_1$ and $E_2$ must be joined to one end of the potentiometer wire.
- DBoth $(A)$ and $(B)$.
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