Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsOrbit of a Test Charge in the Field of a Charged Ringhttp://demonstrations.wolfram.com/OrbitOfATestChargeInTheFieldOfAChargedRing/]]>http://demonstrations.wolfram.com/OrbitOfATestChargeInTheFieldOfAChargedRing/