At what speed (in m/s) will a proton move in a circular path of the same radius as an electron that travels at 7.95 × 10⁶ m/s perpendicular to the Earth's magnetic field at an altitude where the field strength is 1.20 × 10⁻⁵ T? What would the radius (in m) of the path be if the proton had the same speed as the electron?
