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AP Physics 2
11.7 Kirchhoff’s Junction Rule
11.1 Electric Current
BeginnerMCQMathematicalConceptual23.7k
A schematic diagram showing three solid lines representing conducting wires meeting at a central black dot labeled J. Wire 1 extends horizontally from the left to junction J, with an arrow on the wire pointing rightward toward J, labeled \(I_1 = 5.0\text{ A}\). Wire 2 extends diagonally toward the upper right away from junction J, with an arrow pointing upward and rightward along the line, labeled \(I_2 = 2.0\text{ A}\). Wire 3 extends diagonally toward the lower right away from junction J, with no directional arrow, labeled Wire 3. No other labels, lines, text, or axes appear.
Three conducting wires meeting at junction J.
Three long, straight conducting wires meet at a single junction J in a direct-current circuit, as shown in the diagram. Wire 1 carries a steady current of \(5.0\text{ A}\) directed toward the junction, and Wire 2 carries a steady current of \(2.0\text{ A}\) directed away from the junction. What are the magnitude and direction of the current in Wire 3?

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