High Quality Content by WIKIPEDIA articles! A velocity selector is used in accelerator mass spectrometry to select particles based on their speed. The velocity selector is composed of orthogonal electric and magnetic fields, such that particles with the correct charge to mass ratio and speed will be unaffected, and other particles will be deflected.Any charged particle in an electric field will feel a force proportional to the charge and field strength such that vec{F} = q vec{E} , where F is force, q is charge, and E is electric field. Similarly, any particle moving in a magnetic field will feel a force proportional to the velocity and charge of the particle.

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