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The aurora is caused when electrons and protons, moving in the earth's magnetic field of ≈5.0×10^−5T,...

The aurora is caused when electrons and protons, moving in the earth's magnetic field of ≈5.0×10^−5T, collide with molecules of the atmosphere and cause them to glow.

What is the radius of the circular orbit for a proton with speed 7.0×104 m/s?

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The aurora is caused when electrons and protons, moving in the earth's magnetic field of ≈5.0×10^−5T,...
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