2. The Magnetic Field

5. The force on a charge q moving with a velocity The magnitude of the force

6. left-hand rule right-hand rule

7. Motion in magnetic field 1) Uniform, 2) Uniform, 3) Nonuniform

9. The angular velocity

10. The angular velocity (cyclotron frequency ) does not depend on velocity! The force is always perpendicular to velocity, so it cannot change the magnitude of the velocity, only its direction. The work done by the magnetic force is zero! Motion of a charged particle under the action of a magnetic field alone is always motion with constant speed.

11. Electron motion in a microwave oven A magnetron in a microwave oven emits electromagnetic waves with frequency f=2450 MHz. What magnetic field strength is required for electrons to move in circular paths with this frequency?

12. Have a great spring break!