Magnetism 3D Lab is a free, browser-based interactive magnetic-field simulator for high-school and introductory undergraduate physics. Students construct scenes from straight and finite wires, current loops, solenoids, toroids, bar magnets, and uniform-field regions, then explore fields in 2D and 3D. Visualization modes include heatmaps, line integral convolution (LIC), iron filings, field vectors, and 3D field lines.
A closed-path integral tool supports investigations of Ampère's law on user-drawn loops. Charged-particle trajectories in 2D and 3D illustrate magnetic forces with adjustable initial conditions. Example investigations include Helmholtz-coil field uniformity, solenoid fields, magnetic dipoles, and cyclotron motion.
The simulator supports lecture demonstrations, pre-lab visualization, computer-based lab activities, and student inquiry in AP Physics C: Electricity and Magnetism, IB Physics, and introductory university E&M courses. Scenes can be shared by URL and embedded via iframe in course pages. No installation or registration is required.
The software is proprietary and is not Creative Commons licensed. Free educational use, sharing scenes, classroom embedding, and screenshots or short videos with attribution are permitted under the provider's custom terms: https://electromagnetism3d.com/terms/.
