---
title: "A long, straight, solid cylindrical wire of radius \\(R\\) carries a steady current \\(I_0\\) that is uniformly distributed across its cross-sectional area. Which of the following graphs best represents the magnitude of the magnetic field \\(B\\) as a function of the radial distance \\(r\\) from the central axis of the cylinder for \\(0 \\le r \\le 3R\\)?"
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url: "https://nerd-notes.com/ubq/121264/"
date_modified: "2026-08-23T04:59:04+00:00"
---

# A long, straight, solid cylindrical wire of radius \(R\) carries a steady current \(I_0\) that is uniformly distributed across its cross-sectional area. Which of the following graphs best represents the magnitude of the magnetic field \(B\) as a function of the radial distance \(r\) from the central axis of the cylinder for \(0 \le r \le 3R\)?

A long, straight, solid cylindrical wire of radius \(R\) carries a steady current \(I_0\) that is uniformly distributed across its cross-sectional area. Which of the following graphs best represents the magnitude of the magnetic field \(B\) as a function of the radial distance \(r\) from the central axis of the cylinder for \(0 \le r \le 3R\)?

- **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/121264/*