Question

Identical cells each of e.m.f. E and internal resistance r are joined in series to form a closed circuit. One cell A is joined with reverse polarity. The potential difference across each cell except A is

(1)  2E/n

(2) (n -1)E/n

(3)  (n-2)E/n

(4)  2nE/(n - 2)

Answer 1

Correct option (1)  2E/n

Explanation:

n identical cells connected in series Equivalent E.M.F. E = E ′ n E

Equivalent EMF of each cell = E'/n = E

If a cell connected with reverse polarity

Net P.D across each cell expect A

= 2E/n