Charge Particle Moving in a Magnetic Field
A charge particle moves into a region of a uniform magnetic field. The charge particle's initial velocity is perpendicular to the magnetic field so that all the motion is in a xy-plane. The motion is viewed from along z-axis which is also the direction along which the magnetic field is oriented. The direction of the magnetic field can be reversed as well as it magnitude. Likewise, the sign of the charge as well as its magnitude can be changed.