Question 5 Let's test your expression. An electron originally at rest is accelerated by a 6.6-V potential difference between the electrodes. The electron passes through a hole in one of the electrodes and enters a region of uniform magnetic field, with its velocity vector perpendicular to the field. The electron is observed to describe a circular orbit of radius r = 0.14 m. What is the magnitude of the magnetic field, in MILLITESLAS? Mass of the electron: 9.1x10-31 kg Charge of the electron: 1.6x10-19 C