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Physics 8 Online
OpenStudy (anonymous):

The aurora is caused when electrons and protons, moving in the earth's magnetic field of ≈5×10−5 T, collide with molecules of the atmosphere and cause them to glow. What is the radius of the circular orbit for (a) an electron with speed 4.0×106m/s and (b) a proton with speed 6.0×104m/s .

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