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

he aurora is caused when electrons and protons, moving in the earth's magnetic field of , 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 3.0×106 and (b) a proton with speed 7.0×104 .

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