A) 2A from A to B
B) 2A from B to A
C) 3A from A to B
D) 2A from B to A
Correct Answer: C
Solution :
[c] Kirchhoff?s junction rule states that the algebraic sum of all currents into and out of any branch point is zero: \[\sum I=0\] By convention, the sign of current entering a junction is positive and current leaving a junction is negative. \[4A+5A-6A+{{I}_{AB}}=0,\]Therefore \[{{I}_{AB}}=-3A.\] The wire between points A and B carries a current of 3A away from the junction.
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