Explanation
The cell has constant emf,
Resistance is R_1 and R_2
P = V_2 / R_1 + r
P = V_2 / R_2 - r
( R_1- R_2 ) / 2
The internal resistance of the cell is ( R_1 - R_2 ) / 2
Hence,
option (A) is correct answer.
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