A battery consists of a variable number '$n$' of identical cells having internal resistances connected in series. The terminals of battery are short circuited and the current $i$ is measured. Which of the graph below shows the relation ship between $i$ and $n$
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(d) Short circuited current $i = \frac{{nE}}{{nr}} = \frac{E}{r}$ i.e. $i$ doesn't depend upon $n$ .
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