Near Earth, the density of protons in the solar wind (a stream of particles from the Sun)

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Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 8.70 cm-3, and their speed is 470 km/s.
(a) Find the current density of these protons.
(b) If Earth's magnetic field did not deflect the protons, what total current would Earth receive?
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Fundamentals of Physics

ISBN: 978-0471758013

8th Extended edition

Authors: Jearl Walker, Halliday Resnick

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