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‘n' identical cells are joined in series with two cells A and B with reverse polarities. Calculate the potential difference across the cell A and B .
Asuming internal resistances be r and emf e for each cell joined in series.then Total emf = netotal resistance = nrTotal Potential Differnce,(n-2)e – 2e = e(n-4)V = ir + e = 2e(1-2/n)
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