A cosmic-ray electron moves at 7.5×10^{6}m/s perpendicular to Earth’s magnetic field at an altitude where the field strength is 1.0×10^{−5}T. What is the radius of the circular path the electron follows?

^{6}m/s perpendicular to Earth’s magnetic field at an altitude where the field strength is 1.0×10^{−5}T. What is the radius of the circular path the electron follows?