Question

Two ideal emf devices are connected to a set of resistors as shown in the figure below. If E1 = 7.50 V, R1 = 12.00 ?, R2 = 4.50 ?, R3 = 14.50 ?, R4 = 19.50 ?, and the current through R4 is 0.240 A, what is the emf E2?

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