Consider the circuit shown in the sketch. R1 = 3.0 Ω, R2 = 6.0 Ω, R3 = 6.0 Ω. and R4 = 12.0 Ω. What is the potential difference Vab between points a and b and what is the potential difference Vbc between points b and c?
a) Vab =
b) Vbc =
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