PHYS W1402 Lecture Notes - Lecture 28: Cathode Ray Tube, J. J. Thomson, Magnet
2 May 2016
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Chapter 28: magnetic fields: 28. 1 magnetic fields and the definition of, what produces a magnetic field. Firing a charged particle through , using varying speeds and directions to determine # that acts on particle at that point. Discovering that magnitude of # is always proportional to , where is the angle between the zero-force axis and the direction of. The field is: =, where q is the charge of the particle. Thus # = = , where is the angle between directions of velocity and. # = 0 when charge or speed is stationary, also if and are either parallel or antiparallel ( = 0 180) Directions: using right hand rule, you can get the direction of # if you cross and . If is positive, gets direction of #, on the other hand if is negative, the gets opposite of direction of #. Force # acting on charge particle moving through is always perpendicular to and : unit.
