The aurora is caused when electrons and protons, moving in the earth's magnetic field, collide with molecules of the atmosphere and cause them to...

The aurora is caused when electrons and protons, moving in the earth's magnetic field, collide with molecules of the atmosphere and cause them to glow. If the magnetic field in a particular region of the earth is 4.2 10-5 T, calculate the radius of the cyclotron orbit for the following two particles.(a) an electron with speed 1.0 106 m/s