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(D) If at any instant,the current through the circuit is $i$,then applying Kirchhoff's voltage law to the circuit (assuming a source with $EMF$ $E$ an

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(D) If at any instant,the current through the circuit is $i$,then applying Kirchhoff's voltage law to the circuit (assuming a source with $EMF$ $E$ and internal resistance $R$): $iR + e = E$ Rearranging the equation,we get: $e = E - iR$ This equation is of the form $y = mx + c$,where $y = e$,$x = i$,$m = -R$ (slope),and $c = E$ (intercept). Since the slope is negative $(-R)$ and the intercept is positive $(E)$,the graph between $e$ and $i$ will be a straight line with a negative slope and a positive intercept on the $e$-axis. Therefore,the correct graph is represented by option $D$.

For the previous objective,which of the following graphs is correct?

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