About this Simulation

This interactive simulation models the Wien (E×B) filter, a device that uses crossed electric and magnetic fields to select particles by velocity. Learners can adjust field strengths and observe how charged particles either pass straight through or deflect, depending on whether electric and magnetic forces balance.

Learning objectives: Understand how perpendicular electric and magnetic fields exert forces on moving charges | Predict particle trajectories when forces balance versus compete | Apply the concept of velocity selection in charged particle filtering