Lecture
This lecture covers the motion of charged particles in uniform magnetic fields, including cyclotron frequency and trajectories. It also discusses the mirror effect on charged particles near magnetic poles, leading to the formation of auroras. The concept of a speed selector for particles is explained, along with the operation of a mass spectrometer for ion analysis. Additionally, magnetic trapping of particles and the use of magnetic lenses in electron microscopes are explored. The lecture concludes with the calculation of force and torque on current distributions in magnetic fields.