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## Main Question or Discussion Point

in mass spectrometry, velocity selectors are used to select charged particles with a certain velocity.

They use perpendicular electric and magnetic fields. Particles whose velocities equal the ratio of the electric field strength to magnetic flux density are not deflected and are thus "selected"

but what is the motion of a particle which is not selected?

It is neither parabolic nor circular. What is the mathematical equation to describe the particle's path wrt time?

They use perpendicular electric and magnetic fields. Particles whose velocities equal the ratio of the electric field strength to magnetic flux density are not deflected and are thus "selected"

but what is the motion of a particle which is not selected?

It is neither parabolic nor circular. What is the mathematical equation to describe the particle's path wrt time?