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 
  • A$-r$ and $\varepsilon $
  • B$r$ and $-$$\varepsilon $
  • C$-$$\varepsilon $ and $ r$
  • D$\varepsilon $ and $ -r$
AIPMT 2009, Easy
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