Question

A battery consists of $n$ number of identical cells having internal resistance connected in series. The terminals of the battery are short circuited and the current $I$ is measured.
Which of the following graphs shows correct relationship between $I$ and $n$?

• A.
• B.
• C.
• D.

Answer 1

The correct option is D


Equivalent emf $=nE$

Equivalent resistance $=nr$

$\therefore i=\frac{nE}{nr}=\frac{E}{r}$

Current is independent of $n$.

Hence the correct graph is given in option D.