MCQ

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$n$ identical cells are joined in series with its two cells $A$ and $B$ in the loop with reversed polarities. $EMF$ of each shell is $E$ and internal resistance $r$. Potential difference across cell $A$ or $B$ is (here $n > 4$) 

• A
  $\frac{{2\,E}}{n}$
• B
  $2E\left( {1 - \frac{1}{n}} \right)$
• C
  $\frac{{4\,E}}{n}$
• ✓
  $2E\left( {1 - \frac{2}{n}} \right)$