Paths of Charged Particles in Electric and Magnetic Fields

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Abstract
A combination of electric and magnetic fields is described which is suitable for positive-ray analysis experiments, or precise determinations of the ratio of charge to mass. The orbits of charged particles in the radial electric field and transverse magnetic field of the system are computed, and it is shown that a beam of rays of various velocities diverging from a point are brought to a focus provided the variations are not too large. Formulas are given for computing the errors introduced by variations in direction and velocity.

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