An Electron Is Accelerated to an Energy of 100 EV

Multiple Choice

An electron is accelerated to an energy of 100 eV and then enters a magnetic field of strength 0.15 T. The resulting radius of the electron's trajectory is

A) 2.2 * 10^-4 m.
B) 3.3 *10^-4 m.
C) 4.4 * 10^-4 m.
D) 5.5 * 10^-4 m.