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A cosmic-ray proton in interstellar space has an energy of 13.0 MeV and executes a circular orbit having a radius equal to that of Earth's orbit...
A cosmic-ray proton in interstellar space has an energy of 13.0 MeV and executes a circular orbit having a radius equal to that of Earth's orbit around the Sun (1.50 1011 m). What is the magnetic field in that region of space?