---
title: "Three long, straight, parallel wires lie in the same plane with equal spacing \\(d\\) between adjacent wires. Wires 1 and 2 carry equal currents \\(I\\) out of the page, while Wire 3 carries an equal current \\(I\\) into the page. Which of the following correctly ranks the magnitudes of the net magnetic force per unit length, \\(F/L\\), exerted on each wire?"
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url: "https://nerd-notes.com/ubq/118568/"
date_modified: "2026-08-04T08:11:24+00:00"
---

# Three long, straight, parallel wires lie in the same plane with equal spacing \(d\) between adjacent wires. Wires 1 and 2 carry equal currents \(I\) out of the page, while Wire 3 carries an equal current \(I\) into the page. Which of the following correctly ranks the magnitudes of the net magnetic force per unit length, \(F/L\), exerted on each wire?

Three long, straight, parallel wires lie in the same plane with equal spacing \(d\) between adjacent wires. Wires 1 and 2 carry equal currents \(I\) out of the page, while Wire 3 carries an equal current \(I\) into the page. Which of the following correctly ranks the magnitudes of the net magnetic force per unit length, \(F/L\), exerted on each wire?

![Three circular cross sections of wires aligned horizontally on a single dashed line, labeled from left to right as Wire 1, Wire 2, and Wire 3. Wire 1 contains a central dot indicating current out of the page. Wire 2 contains a central dot indicating current out of the page. Wire 3 contains a central cross indicating current into the page. Below the dashed line, two horizontal dimension lines show a distance d between Wire 1 and Wire 2, and a distance d between Wire 2 and Wire 3. No other labels, lines, text, or axes appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1785831083-jrH3vY.jpg)

- **A.** \(F_1 > F_2 > F_3\)
- **B.** \(F_2 > F_1 > F_3\)
- **C.** \(F_2 > F_3 > F_1\)
- **D.** \(F_3 > F_2 > F_1\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/118568/*