2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/83458Motion of a charged particle with finite size, described by Sommerfeld model, in static magnetic field has two peculiar features: 1.) there is the effect of tunneling - Sommerfeld particle overcomes the barrier and finds itself in the forbidden, from classical point of view, area; 2.) the untwisting of trajectory in cyclotron for Sommerfeld particle is strongly delayed compared to that of a classical particle.LATEXClassical PhysicsAccelerator Physicstext