16_2?Applications?of?Charged?Particles?Moving? in?Magnetic?and?Electric?Fields Mar/21/2016 M.?Burkardt?? NMSU?? PHYS?214?? Spring?2016 1 Phys214 Electricity & Magnetism Applications of Motion of Charged Particles in Electric/Magnetic Fields Charged Particle in Electric and Magnetic Fields Review Electric and Magnetic Fields In an electric field there is always a force on a charged particle, which is independent of the speed of the particle. The force is directed perpendicular to the velocity vector ?The velocity changes direction, but its magnitude (speed) stays the same. ? no work is done. EF qE? Constant uniform electric fields change the speed of a charged particle (if no crossed magnetic field is also present). In a magnetic field a charged