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Which reasoning correctly explains why the current entering a junction must equal the current leaving it in a steady-state circuit?
AOtherwise the resistance at the junction would become zero
BOtherwise charge would accumulate or deplete at the junction with time
COtherwise the voltage of every branch would become identical
DOtherwise the loop sum of voltages would become nonzero
Answer & Solution
Correct answer: B. Otherwise charge would accumulate or deplete at the junction with time
KCL follows from conservation of charge. If more current entered than left, charge would build up at the junction; if more left than entered, charge would be depleted. In steady state that does not happen, so entering current equals leaving current.