Correct AnswerB. There cannot be an accumulation of charge at a node
Quick Explanation
KCL follows from conservation of electric charge. In the lumped-circuit model, charge does not accumulate indefinitely at an ideal node, so the algebraic sum of currents entering and leaving the node is zero.
Formula / Key Relation
General charge continuity at a node:
Σ i = -dq/dt
Ideal lumped node:
dq/dt = 0
⇒ Σ i = 0
Detailed Explanation
Concept & ReasoningKirchhoff's Current Law is the circuit form of charge conservation. If net current flowed continuously into an ideal node, charge would accumulate and its potential would change without bound. In lumped network analysis the node has negligible storage volume, so the net rate of charge accumulation is zero and the sum of incoming currents equals the sum of outgoing currents. More generally, continuity gives Σi = -dq/dt; KCL is the dq/dt ≈ 0 lumped-node case.How to Solve It in the ExamKCL = conservation of charge.Important Exam PointUse an algebraic sign convention: all entering positive or all leaving positive.Related…
Concept & Reasoning
Kirchhoff's Current Law is the circuit form of charge conservation. If net current flowed continuously into an ideal node, charge would accumulate and its potential would change without bound. In lumped network analysis the node has negligible storage volume, so the net rate of charge accumulation is zero and the sum of incoming currents equals the sum of outgoing currents. More generally, continuity gives Σi = -dq/dt; KCL is the dq/dt ≈ 0 lumped-node case.
How to Solve It in the Exam
KCL = conservation of charge.
Important Exam Point
Use an algebraic sign convention: all entering positive or all leaving positive.
Related Revision Path
This question sits in the revision path Network Theory → Kirchhoff's Laws → KCL .
Quick Trick
KCL = conservation of charge.
Common Mistake
Do not confuse KCL with energy conservation; KVL is more closely linked to electric-field/energy considerations.
Exam Tip
Use an algebraic sign convention: all entering positive or all leaving positive.
SEO + Knowledge GraphRelated PYQs & Exam ContextExam path, knowledge path and deeper practice links.
Assistant Engineer (Electrical), Class-2, Road and Building Department2025Q. 113Assistant Engineer (Electrical), Class-2, Road and Building Department2025Q. 113Assistant Engineer (Electrical), Class-2, Road and Building Department2025Q. 113Assistant Engineer (Electrical), Class-2, Road and Building Department2025Q. 113Assistant Engineer (Electrical), Class-2, Road and Building Department2025Q. 113Assistant Engineer (Electrical), Class-2, Road and Building Department2025Q. 113Assistant Engineer (Electrical), Class-2, Road and Building Department2025Q. 113Assistant Engineer (Electrical), Class-2, Road and Building Department2025Q. 113Assistant Engineer (Electrical), Class-2, Road and Building Department2025Q. 113
