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(D) When '$n$' identical cells,each with electromotive force '$E$' and internal resistance '$r$',are connected in series,the total electromotive force

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(D) When '$n$' identical cells,each with electromotive force '$E$' and internal resistance '$r$',are connected in series,the total electromotive force of the battery is '$nE$' and the total internal resistance is '$nr$'.When the terminals of the battery are short-circuited,the external resistance is zero.According to Ohm's law,the current '$i$' flowing through the circuit is given by:$i = \frac{	ext{Total EMF}}{	ext{Total Resistance}} = \frac{nE}{nr} = \frac{E}{r}$Since '$E$' and '$r$' are constants for the given cells,the current '$i$' is independent of the number of cells '$n$'.Therefore,the graph representing the relationship between '$i$' and '$n$' is a horizontal straight line parallel to the '$n$-axis'.This corresponds to Graph $D$.

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