In the multimedia manual ''Charged particles in a magnetic field'' the following materials are clearly presented in the dynamics Lorentz force, motion of charged particles in a uniform magnetic field, principle of operation of the cyclotron, peculiarities of motion of charged particles in heterogeneous magnetic fields, principle of operation of magnetic mirrors and mirror magnetic traps, Earth's magnetic field, radiation belts and auroras. The "Methodological Guidelines" file contains additional material that can be used when demonstrating the manual, it is convenient to pre-print. The manual can be used in the teaching of physics at university, school and for self-education