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AP Physics C: E&M
12.3 Magnetic Fields of Current-Carrying Wires and the Biot-Savart Law
IntermediateMCQGraphicalMathematicalConceptual21.3k
A Cartesian coordinate plane showing a horizontal x-axis and a vertical y-axis intersecting at the origin (0,0). At the origin, a small circle contains a centered dot representing current directed out of the page, labeled 2I_0. On the positive x-axis at a distance labeled d, an identical small circle contains an \times symbol representing current directed into the page, labeled I_0. A dashed horizontal line extends along the positive x-axis past position d. No other labels, lines, text, or axes appear.
Cross section of two parallel wires in the xy-plane.
Two long, straight parallel wires are perpendicular to the xy-plane and intersect the x-axis at x = 0 and x = d. Wire 1 is located at x = 0 and carries a steady current 2I_0 directed out of the page. Wire 2 is located at x = d and carries a steady current I_0 directed into the page. Which of the following graphs best represents the y-component of the net magnetic field, B_y, along the x-axis as a function of position x?

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