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In the current-junction diagram, suppose an additional current of $2\text{ A}$ enters the node while all other labeled currents remain unchanged. What must happen to preserve Kirchhoff's Current Law? 
AThe total outgoing current must increase by $2\text{ A}$
BThe total outgoing current must decrease by $2\text{ A}$
CThe total incoming current must decrease by $2\text{ A}$ automatically
DKirchhoff's Current Law no longer applies
Answer & Solution
Correct answer: A. The total outgoing current must increase by $2\text{ A}$
KCL requires total current entering the node to equal total current leaving it. If incoming current increases by $2\text{ A}$ and the node does not accumulate charge, the outgoing current must also increase by $2\text{ A}$.