A cell has an open circuit voltage V₁ and a closed circuit voltage V₂ when a current is flowing through it. Therefore, the internal resistance of the cell is

A. \(\frac{V_2}{I}\)
B. \(\frac{V_1}{I}\)
C. \(\frac{(V_1 + V_2)}{I}\)
D. \(\frac{(V_1 - V_2)}{I}\)
E. \(\frac{(V_2 - V_1)}{I}\)  

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Correct Answer: E