This demo illustrates nonrelativistic motion of a positively charged particle in a region containing constant, uniform electric and magnetic fields.

The units of magnetic and electric field are arbitrary in this demo. The z-axis is initially vertical. The black parts of the axes denote positive values, and grey negative.

Instructions for use

• Set the components of the initial velocity, electric field, and magnetic field using the scrollbars provided.
• The vectors may be set to zero by clicking on the small buttons at the top right corners of the scrollbar triples.
• Click "launch" to launch the particle from the origin.
• Repeat as often as desired.
• Click "clear" to clear previous paths without changing the vectors.
• Click "reset" to reset everything to its initial state.
• To change the angle of view, drag the plot area using the mouse (horizontally to vary the azimuthal angle and vertically to vary the polar angle.)