Question Detail
Question
Four wires meet at junction: 4A in, 5A out, 2A out. Fourth carries?
Correct Answer
Option A is the correct answer.
Detailed Explanation
ΣI_in = ΣI_out. In = 4 + I₄. Out = 5+2=7. 4+I₄=7 → I₄=3 A into junction.
Hint
KCL: sum in = sum out.