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

(a) 2ℰ / n

(b) n - 1/n ℰ 

(c) n - 2/n ℰ

(d) 2n/n - 2 ℰ

Answer 1

Correct Answer is: (a) 2ℰ / n

i = (n - 2)ℰ / nr.

V_B = V_A = -ir + ℰ = ℰ - (n - 2)ℰ / nr r