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Why does Kirchhoff's Current Law imply that charge does not build up at an ideal circuit junction?
ABecause the voltage at every branch is zero
BBecause the junction has infinite resistance
CBecause the rate of charge entering equals the rate of charge leaving
DBecause current can flow only in one branch at a time
Answer & Solution
Correct answer: C. Because the rate of charge entering equals the rate of charge leaving
Current is the rate of flow of charge. If the total current entering a junction equals the total current leaving it, then charge is not accumulating there. That is the physical meaning of KCL for an ideal node.