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Find Vab and Is.
Va=R4R3+R4E=26+2×12=3V
Vb=R2R1+R2E=35+3×12=4.5V
Vab=Va-Vb=3-4.5=-1.5 V
Is=I1+I3=Vb3+Va2=4.53+32=3 A
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