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NEET2026PhysicsChapterActual

Twelve identical cells, each of emf E and internal resistance r , are connected in series. The free ends of this combination are then short-circuited to form a closed loop. By mistake, one of the cells is connected with its polarity reversed. The terminal potential difference across the cell with reversed polarity is:

Options

  1. A11E 6
  2. BE 6
  3. C5E 6
  4. D2E

Correct answer

A. 11E 6

Step-by-step solution

Total number of cells is 12 . One cell is connected with reversed polarity. Net emf of the circuit is E_ net = 11E - E = 10E . Total internal resistance of the circuit is R_ net = 12r . Current in the closed loop is I = E_ net R_ net = 10E 12r = 5E 6r . The current flows in the direction of the 11 correctly connected cells, meaning it enters the positive terminal of the reversed cell. Thus, the reversed cell is being charged. The terminal potential difference across a cell being charged is given by V = E + Ir . Sub

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