Question

Two non ideal batteries are connected in series. Consider the following statements
(A) The equivalent emf is larger than either of the two emfs.
(B) The equivalent internal resistance is smaller than either of the two internal resistances.

• A. Both A and B are correct
• B. A is correct but B is wrong
• C. B is correct but A is wrong
• D. Both A and B wrong

Answer 1

Answer: (B)

A is correct but B is wrong

If we add two non ideal batteries in series then
so in case (a) the equivalent e.m.f. may be larger than either of two e.m.f., but in case (b) the equivalent e.m.f. may be smaller than either of two e.m.f.
In series total resistance is always greater than individual resistance, whether batteries are connected in any way

[i.e. either according to case (a) or case (b)].