A) Not possible
B) Yes, if another identical battery is joined is series
C) Yes, possible if another battery is joined in opposition
D) Yes, possible if another similar battery is joined in parallel
Correct Answer: B
Solution :
Potential difference between the plates of a cell can be zero, if the drop across its internal resistance is equal to its emf. For that, current in the circuit should be, \[I=\frac{E}{r}=\frac{2E}{2r}\] This can be obtained by connecting another identical battery in series. So, the correct option is [b]. If another similar battery is joined in opposition, the current in the circuit will be zero but potential difference across a cell will be equal to its emf and not zero. So, the correct option is [b].
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