PHYSICS · Subjective · AP · Physics 2: Algebra-based · Electric Circuits · Electric Circuits
Problem
A single-loop circuit is arranged so that, when traversed clockwise starting at point P, the following elements are met in sequence:
• Battery A: potential rise of 48 V, followed immediately by an internal resistance of 0.60 Ω.
• External resistor R: 75 Ω.
• Battery B: potential drop of 12 V, followed immediately by an unknown internal resistance r_B.
A steady clockwise current of 0.40 A is measured in the loop.
Determine the value of r_B.