AIPMT PRELIMS2006Physics-Current Electricity
AIPMT PRELIMS 2006 Physics Internal Resistance of Cells MCQ Question
Type: MCQ-conceptual-Medium-Class 12
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:
A
r¹⁻ r2
B
(r¹⁺ r2)/2
C
(r¹⁻ r2)/2
D
r¹⁺ r2
Correct Answer
Option A
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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