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Download 2.1.7 particle movement in magnetic fields
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The effect of an electric field on the motion of a charged particle can be to change speed or direction. The effect of a magnetic field on a charged particle can only be to change its direction. This is because the force applied is always perpendicular to its motion. Use Flemings left to verify the direction of the force acting on the positive charge. In which direction was this proton introduced into this field? The force due to the magnetic field causes centripetal acceleration. Therefore – F = BQv = mv2/r r = mv/BQ r is the radius of the circular path (m). The use of both fields in conjunction with each other is seen in a ‘velocity selector’. For any charged particle, these fields will influence their motion. If the particles continue in a straight line then BQv = QE Faster particles will have a greater force upwards and slower particles will move down.