*28. Review Conceptual Example 2 as background for this problem. A charged particle moves through a velocity selector at a constant speed in a straight line. The electric field of the velocity selector is 3.80 x 103 N/C, while the magnetic field is 0.360 T. When the electric field is turned off, the charged particle travels on a circular path whose radius is 4.30 cm. Find the charge-to-mass ratio of the particle.

For a velocity selector we find the sum of the electric force and the magnetic force add to zero. This provides the relationship

Now for the circular path part, use sum of forces in radial direction

Solve for speed

Use v from velocity selector

Solve for q/m

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