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Suppose the Earth's magnetic field at the equator has magnitude 0.40 ×10−4T and a northerly direction...

Suppose the Earth's magnetic field at the equator has magnitude 0.40 ×10−4T and a northerly direction at all points. Estimate the speed a singly ionized uranium ion (m=238u,q=e) would need to circle the Earth 5.0 km above the equator.

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