An electron travels to the right, as shown in the figure below, starting in a region of zero magnetic field, and then entering a region of uniform magnetic field, pointing into the page, with a magnitude of b = 1.35 mT. XX X X X X X X X X X X X X X B=0 B=b @ (a) Once the electron enters the region of nonzero magnetic field, it travels in a complete semicircle before exiting the region of field again. (That is, it exits the region moving to the left.) How long (in s) is the electron in the region of nonzero field? (13268 | s - (b) The electron penetrates a maximum depth of 1.80 cm into the region of nonzero field. What is the kinetic energy (in eV) of the electron? 8.022E4 | X From the l:SU|t of part (a), and the fact that the trajectory is a semicircle, what is the angular speed? Can you relate this to the speed and radius? How then is speed related to kinetic energy? eV