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According to the current-junction figure, which set of currents is directed into the node? 
A$I_4$, $I_5$, and $I_6$
B$I_1$, $I_2$, and $I_3$
C$I_1$, $I_4$, and $I_6$
D$I_2$, $I_5$, and $I_6$
Answer & Solution
Correct answer: B. $I_1$, $I_2$, and $I_3$
In the figure, the arrows for $I_1$, $I_2$, and $I_3$ point toward the central junction, while $I_4$, $I_5$, and $I_6$ point away from it. So the incoming currents are $I_1$, $I_2$, and $I_3$.