---
title: "Two long, straight, parallel wires are oriented perpendicular to the xy-plane and carry equal currents I in opposite directions. Wire 1 passes through the origin (x, y) = (0, 0) with current directed out of the page (+z-direction). Wire 2 passes through (x, y) = (d, 0) with current directed into the page (-z-direction). The +y-direction is directed toward the top of the page. Which of the following graphs best represents the y-component of the net magnetic field, B_y, along the x-axis in the region 0 < x < d?"
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url: "https://nerd-notes.com/ubq/123406/"
date_modified: "2026-09-28T11:58:22+00:00"
---

# Two long, straight, parallel wires are oriented perpendicular to the xy-plane and carry equal currents I in opposite directions. Wire 1 passes through the origin (x, y) = (0, 0) with current directed out of the page (+z-direction). Wire 2 passes through (x, y) = (d, 0) with current directed into the page (-z-direction). The +y-direction is directed toward the top of the page. Which of the following graphs best represents the y-component of the net magnetic field, B_y, along the x-axis in the region 0 < x < d?

Two long, straight, parallel wires are oriented perpendicular to the xy-plane and carry equal currents I in opposite directions. Wire 1 passes through the origin (x, y) = (0, 0) with current directed out of the page (+z-direction). Wire 2 passes through (x, y) = (d, 0) with current directed into the page (-z-direction). The +y-direction is directed toward the top of the page. Which of the following graphs best represents the y-component of the net magnetic field, B_y, along the x-axis in the region 0 < x < d?

![A Cartesian coordinate system in the xy-plane with a horizontal x-axis pointing right and a vertical y-axis pointing up. Wire 1 is represented as a small circle centered at the origin (0, 0) with a central dot and labeled I out of page. Wire 2 is represented as a small circle centered at (d, 0) with an x symbol and labeled I into page. A dashed horizontal segment lies along the x-axis connecting the two wires from x = 0 to x = d, with the midpoint labeled d/2. No other labels, lines, text, or axes appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1790596701-4eJ7ME.jpg)

- **A.** Graph A
- **B.** Graph B
- **C.** Graph C
- **D.** Graph D

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/123406/*