Question

In the figure of a potentiometer arrangement, $B$ is the main battery, $C$ is the cell whose emf is to be determined, $W{W}^{\prime }$ is the potentiometer wire, $G$ is the galvanometer and $J$ is the jockey which may touch any point on the wire $W{W}^{\prime }$. Choose the correct alternative/s for the potentiometer to work properly

• A. The emf of $B$ must be greater than the emf $C$
• B. Two batteries $B$ and $C$ must be joined so that the same polarity terminals are joined together
• C. The postive terminals of two cells must be together to end $W$
• D. The galvanometer resistance must be less than the resistnace of potentiometer to end $W$.

Answer 1

Answer: (A), (B)

The correct options are
A The emf of $B$ must be greater than the emf $C$
B Two batteries $B$ and $C$ must be joined so that the same polarity terminals are joined together