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AP Physics C: E&M
11.7 Kirchhoff’s Junction Rule
BeginnerMCQDrawing RepresentationsConceptual15.6k
A circular central node with five straight line segments radiating outward at equal angles of approximately 72 degrees. The top-left segment is labeled Branch 1 with a solid arrow pointing inward toward the central node and text reading 7 A. The bottom-left segment is labeled Branch 2 with a solid arrow pointing outward away from the central node and text reading 2 A. The bottom-right segment is labeled Branch 3 with a solid arrow pointing inward toward the central node and text reading 4 A. The top-right segment is labeled Branch 4 with a solid arrow pointing outward away from the central node and text reading 5 A. The uppermost vertical segment is labeled Branch 5 with a question mark symbol and no arrow. No other labels, lines, text, or axes appear.
Five wire branches meeting at a central junction.
A single junction in a direct-current circuit connects five separate wire branches in a steady state. The currents in branches 1 through 4 are given in the table.

BranchCurrent MagnitudeDirection Relative to Junction
Branch 17 AToward junction
Branch 22 AAway from junction
Branch 34 AToward junction
Branch 45 AAway from junction

Which of the following diagrams correctly represents the magnitude and direction of the current in branch 5 to satisfy conservation of electric charge?

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