AIPMT PRELIMS 2009 Physics Ohm's Law MCQ Question
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:
r and ε
r and -ε
-ε and r
ε and -r
Correct Answer
Detailed Explanation
The terminal potential difference V is given by V = ε - Ir. The slope of the V⁻I graph is -r, and the intercept is ε.
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