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# Feb18note - PHYS142 Lecture 19 Magnetic Fields Chapter 29 All sections except 6 29.1 Magnetic Fields and Forces 29.2 Motion of a Charged Particle

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Magnetic Fields • Chapter 29 All sections except 6 29.1 Magnetic Fields and Forces 29.2 Motion of a Charged Particle in a Uniform Magnetic Field 29.3 Applications Involving Charged Particles Moving in a Magnetic Field 29.4 Magnetic Force Acting on a Current-Carrying Conductor 29.5 Torque on a Current Loop in a Uniform Magnetic Field PHYS142 Lecture 19 2

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Applications Involving Charged Particles (29.3) 3 In many applications, charged particles will move in the presence of both magnetic and electric fields. In that case, the total force is the sum of the forces due to the individual fields. The total force is called the Lorentz force . In general: ] [ B v E F q (29.6)
Velocity selector This is a device that allows one to select a specific velocity ( magnitude and direction ) for charged particles. Consider electrons being emitted from a hot filament , usually tungsten. I e - e - e - The emitted electrons have different velocities (magnitudes and directions) 4

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A pair of parallel screens with pinholes will select charged particles with a specific direction for their velocities. I e - e - e - e - 5 Velocity selector
magnitude of velocities we apply a uniform magnetic field pointing out of the plane and an electric field produced by a pair of oppositely charged plates. e

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## This note was uploaded on 02/22/2011 for the course PHYS 142 taught by Professor Altounian during the Spring '07 term at McGill.

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Feb18note - PHYS142 Lecture 19 Magnetic Fields Chapter 29 All sections except 6 29.1 Magnetic Fields and Forces 29.2 Motion of a Charged Particle

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