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According to the node shown in the figure, which set of currents is entering the junction? 
A$I_1, I_2, I_3$
B$I_4, I_5, I_6$
C$I_2, I_4, I_6$
D$I_1, I_3, I_5$
Answer & Solution
Correct answer: A. $I_1, I_2, I_3$
From the arrow directions in the figure, $I_1$, $I_2$, and $I_3$ point toward the junction, so they are entering currents. The red-labeled currents $I_4$, $I_5$, and $I_6$ point away from the junction and are leaving.
