A student measures the terminal potential difference $(V)$ of a cell $($ of $emf \;\varepsilon $ and internal resistance $r)$ as a function of the current $(I)$ flowing through it. The slope, and intercept, of the graph between $V$ and $I$, then, respectively, equal
AIPMT 2009, Easy
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$V=\varepsilon-I r$ , comparing with $y=c-m x$
$\therefore \quad$ Slope $=-r,$ internal resistance.
$V_{\max }=\operatorname{emf} \varepsilon .$ This is intercept on the $y-$ axis.
$\therefore$ Slope is negative.
$\therefore \quad I$ decreases as $R$ increases.
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