Doubt by RAVI KUMAR JHA
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 > 4).
Sir how it has been decided in this question that cell is being charged. Please it's urgent
Answers
Answer by Shreya
Number of cells= n
EMF of each cell= E
and internal resistance of each cell= r
Total resistance in circuit= nr
One cell is joined in reverse, so total emf = nE-2E
Current in the circuit, I= nE-2E /nr
=E(n-2)/nr
Potential difference ,V = E- Ir
E-(n-2)E×r /n×r = E[1-(n-2)/n]
=2E/n
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