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AP Physics 2
12.3 Magnetism and Current-Carrying Wires
BeginnerMCQMathematical14.3k
Three diagrams arranged horizontally labeled Case 1, Case 2, and Case 3. Case 1 shows two parallel vertical wires separated by distance d, with the left wire carrying current I upward and the right wire carrying current I downward, with a point P located at the midpoint between them. Case 2 shows two parallel vertical wires separated by distance d, both carrying current I upward, with a point P at the midpoint. Case 3 shows two parallel vertical wires separated by distance 2d, with the left wire carrying current I upward and the right wire carrying current I downward, with a point P at the midpoint. No other labels, lines, text, or axes appear.
Three configurations of parallel wires carrying equal currents.
Three configurations, labeled Case 1, Case 2, and Case 3, each consist of two long, straight parallel wires carrying currents of equal magnitude \(I\). In Case 1, the wires are separated by distance \(d\) and carry currents in opposite directions. In Case 2, the wires are separated by distance \(d\) and carry currents in the same direction. In Case 3, the wires are separated by distance \(2d\) and carry currents in opposite directions. Which of the following correctly ranks the magnitude of the net magnetic field \(B\) at the midpoint between the two wires for each case?

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