The current in the figure below is 0.57 A. (Let the internal resistance of battery 1 be r1 = 1.5 Ω and the internal resistance of battery 2 be r2 = 1.2 Ω.) (a) Find the voltage drop Vab. (b) Find the power dissipated in R. (c) Find the useful electric power supplied by battery 2. (Note: Do not forget the internal resistance of batt

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