A battery consists of a variable number $n$ of identical cells (having internal resistance $r$ each)

Question

A battery consists of a variable number $n$ of identical cells (having internal resistance $r$ each) which are connected in series. The terminals of the battery are short-circuited and the current $I$ is measured. Which of the graphs shows the correct relationship\ between $I$ and $n$ ?\

Professor PC Thomas Classes · Answer

(a) : Current drawn from the cell is $$ I=\frac{n \varepsilon}{n r}=\frac{\varepsilon}{r} $$ So, $I$ is independent of $n$ and $I$ is constant.\