n identical cells are joined in series w...

`n` identical cells are joined in series with two cells A and B with reversed polarities. EMF of each cell is E and internal resistance is r. Potential difference across cell A or B is (n gt 4)

`(2E)/(n)`

`2E((1-(1))/(n))`

`(4E)/(n)`

`2E(1-(2)/(n))`

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