The aurora is caused when electrons and protons moving in, Ask an Expert

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The aurora is caused when electrons and protons, moving in the earth's magnetic field of 5x10^-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 3.0×10^6m/s and (b) a proton with speed 5.0×10^4m/s

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