24 cells of each emf 4V are connected in series. Among them if 5 cells are connected wrongly, the effective emf of the combination is

18V

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56V

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24V

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Solution

The correct option is B 56V
$E^{'} = (N - 2 n) E = (24 - 2 \times 5) E = 14 E = 14 \times 4 E^{'} = 56 V$

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24 cells of each emf 4V are connected in series. Among them if 5 cells are connected wrongly, the effective emf of the combination is

The correct option is B 56VE′=(N−2n)E=(24−2×5)E=14E=14×4E′=56V

The correct option is B 56V
$E^{'} = (N - 2 n) E = (24 - 2 \times 5) E = 14 E = 14 \times 4 E^{'} = 56 V$