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The Northern Lights is caused by charged particles from the sun being funneled to the geographic...

The Northern Lights is caused by charged particles from the sun being funneled to the geographic north pole by Earth’s magnetic field. The magnetic field magnitude at Earth’s surface is appropriately 50 μT (1 μT is a microTesla, which 10^ −6 T) or 0.5 gauss (1 gauss ≡ 10^ −4 T). How long would an electron moving perpendicular to Earth’s magnetic field take to complete one orbit around the magnetic field direction?

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Electron complete its revolution by necessary centipetal force which is provided by magnetic force.

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