AIPMT PRELIMS 2006 Physics Internal Resistance of Cells MCQ Question
Two cells, having the same emf, are connected in series through an external resistance R. Cells have internal resistances r1 and r2 (r1 > r2) respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is:
r¹⁻ r2
(r¹⁺ r2)/2
(r¹⁻ r2)/2
r¹⁺ r2
Correct Answer
Detailed Explanation
For the potential difference across the first cell to be zero, the external resistance R must equal the difference in internal resistances, i.e., R = r¹⁻ r2.
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