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For the circuit shown in the figure, R1 = 50 ?, R2 = 20 ?, R3 = 35 ?, R4 = 10 ?, R5 = 68 ?, I1 = 0.111 A, I2 = 0.142 A, and the batteries are ideal.
(a)Determine V1 and V2.
(b)What is the potential difference across R4?
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