A student measures the terminal potential difference (V) of a cell (of emf ε 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

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ε and −r

-r and ε

r and -ε

-ε and r

answer is B.

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Detailed Solution

According to Ohm's law, dVdI = −rand V = ε if I= As V+Ir=e∴ Slope of the graph =−r and intercept=ε

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