36 cells, each of emf 4V are connected in series and kept in a box. The combination shows an emf of 88V on the outside. Calculate the number of cells reversed.

36 cells, each of emf 4V are connected in series and kept in a box. The combination shows an emf of 88V on the outside. Calculate the number of cells reversed. Correct Answer 7

Number of cells (n) = 36; Emf of each cell (e) = 4V; Total emf (E) = 88V; Let the number of reversed cells be ‘y’ The required equatioEEFF = n × e – 2y × e 88 = 36 × 4 – 2y × 4 88 = 144 – 8y 8y = 56 y = 7 Therefore, there are 7 reversed cells.
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