EM Field Visualizer
See the electric and magnetic fields around moving charges, from any frame, up to near light speed.
Download for Windowsv1.0.0 · 62 MB · free
Science toys
Screenshot coming soon
About
An interactive 3D view of the electric and magnetic fields around parallel streams of electrons and protons. Each moving charge carries its exact relativistic field, which flattens into a pancake as it approaches the speed of light.
Slide the observer frame to ride along with a stream and watch magnetism turn into electricity. Drag a probe charge around and compare the force it feels in the lab with the force computed in your moving frame.
- Electron, proton and neutral-wire streams with adjustable speed and spacing
- Observer frame slider with full Lorentz transformation
- Probe charge with a live force diagram
- Classical Galilean mode to show where pre-relativity physics breaks
Controls
Left-dragRotate
Right-dragPan
WheelZoom
Shift + left-dragMove the probe
Version history
- v1.0.0Oct 17, 2026Add release workflow that publishes a Windows zip