$A$ 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 $I$,respectively,are equal to:
- A$-r$ and $\varepsilon$
- B$r$ and $-\varepsilon$
- C$-\varepsilon$ and $r$
- D$\varepsilon$ and $-r$
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