Question

In the adjoining figure of a potentiometer arrange-ment, B is the main battery, C is the cell whose emfis to be determined, WW' is the potentiometer wire, G is the galvanometer and $J$ is the jockey whichmay touch any point on the wire WW'". Choose thecorrect alternative/s for the potentiometer to work properly

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

Answer 1

Answer: (A), (B)

The correct options are
A The emf of C must be lesser than the emf B.
B Two batteries $B$ and $C$ must be joined so that the

same polarity terminals are joined together.