Conceptual Example 4 provides background pertinent to this problem. An electron has a kinetic energy of 2.5 × 10-17 J. It moves on a circular path that is perpendicular to a uniform magnetic field of magnitude 5.5 × 10-5 T. Determine the radius of the path.
The centripetal force required for the electron to move in a circular path is provided by the uniform magnetic field.
Now, the speed with which the electron moves on the circular path can be found using the expression for the kinetic energy.
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