A velocity selector is used to insert charged particles into a mas spectrometer

Question

A velocity selector is used to insert charged particles into a mas spectrometer at a specific speed. The velocity selector has uniform electric and magnetic fields that are perpendicular to one another and to the motion of the charged particle. If the particle is at the right velocity the magnetic force and electric force will cancel and the particle will continue in a straight line path. The velocity of the particle is: v=E/B. For higher or lower velocities, the particle is deflected and will not pass into the mass spectrometer.

Assuming the particle is positively charged, what are the directions of the forces due to the electric field and the magnetic field?

How does the kinetic energy of the particle change as it travels in the velocity selector?

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Explanation / Answer

When a charged particle (e.g. a positively charged) enters the velocity selector, it will experience forces due to the electric and magnetic field.

the kinetic enegy of the paraticle =Edq

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