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AP Physics 2
12.3 Magnetism and Current-Carrying Wires
IntermediateMCQMathematicalConceptual24.2k
Cross-sectional view of two long straight parallel wires perpendicular to the page. Wire 1 on the left is drawn as a circle containing a dot labeled I pointing out of the page. Wire 2 on the right is drawn as a circle containing an X labeled I pointing into the page. The distance between Wire 1 and Wire 2 is labeled 2d. A horizontal axis line connects both wires and extends to the left and right. Point X is marked on the line midway between Wire 1 and Wire 2 at distance d from each wire. Point Y is marked on the line between Wire 1 and Wire 2 at distance 0.5d to the right of Wire 1. Point Z is marked on the line at distance d to the right of Wire 2. No other labels, lines, text, or axes appear.
Cross section of two parallel wires carrying equal currents in opposite directions.
Two long, straight, parallel wires are separated by a distance \(2d\). Wire 1 carries a current \(I\) out of the page, and Wire 2 carries an equal current \(I\) into the page. Three points, \(X\), \(Y\), and \(Z\), lie along a horizontal line perpendicular to both wires: point \(X\) is located at the midpoint between the wires, point \(Y\) is located a distance \(0.5d\) to the right of Wire 1 (between the wires), and point \(Z\) is located a distance \(d\) to the right of Wire 2. Which of the following correctly ranks the magnitudes \(B_X\), \(B_Y\), and \(B_Z\) of the net magnetic field at points \(X\), \(Y\), and \(Z\)?

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