Compute rL for the following cases:
1. A 10-keV electron in the earth’s magnetic field of 5 x 10-5 T.
2. A solar wind proton with streaming velocity 300 km/s, B = 5 x 10-9 T.
3. A 1-keV He+ ion in the solar atmosphere near a sunspot, where B = 5 x 10-2 T.
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