Question

N identical cells, each of emf e and internal resistance r, are joined in series to form a closed circuit. One cell (a) is joined with reversed polarity. The potential difference across each cell, except a is -

Answer 1

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★ If polarity of one cell is reversed then potential difference is

E(eq) = (n-2)E

→I = (n-2)E/nr

★Total potential difference = E-Ir

T.P.D = E - [(n-2)E/nr ] × r

★ Total potential difference of cell a =

=> E + Ir

=> E +[(n-2)E/nr] × r

=> E[(n+n-2)/n]

=>[ (2n-2)/n] × E

=> (n-1)(2E)/ n

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Answer 2

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