Compute r L for the following cases: 1. A 10-keV electron in the earths magnetic field of

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Question:

Compute r_L 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.