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In Figure, the resistances are R1 = 0.80 Ω, R2 = 2.50 Ω, and the ideal batteries have emfs ε1 = 2.0 V, and ε2 = ε3 = 2.5 V.
(a) What is the current through each battery? (Take upward to be positive.)
(b) What is the potential difference Va - Vb?
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