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AP Physics 2
11.7 Kirchhoff’s Junction Rule
IntermediateMCQMathematicalConceptual21.1k
A central junction node represented by a solid dark circle. Five straight wire lines meet at this central node. Wire 1 extends up and left with an arrow pointing toward the node labeled I_1 = 4.0 A. Wire 2 extends up and right with an arrow pointing away from the node labeled I_2 = 2.5 A. Wire 3 extends down and right with an arrow pointing toward the node labeled I_3 = 1.5 A. Wire 4 extends down and left with an arrow pointing away from the node labeled I_4 = 6.0 A. Wire 5 extends straight down from the node with no arrow, labeled I_5. No other labels, lines, text, or axes appear.
Five-way junction with four labeled currents.
Five conducting wires meet at a single junction in a circuit, as shown in the diagram. Four of the wires carry known currents: \(I_1 = 4.0\text{ A}\) toward the junction, \(I_2 = 2.5\text{ A}\) away from the junction, \(I_3 = 1.5\text{ A}\) toward the junction, and \(I_4 = 6.0\text{ A}\) away from the junction. What are the magnitude and direction of the current \(I_5\) in the fifth wire?

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