8. (a) Since 1 cm3= 10–6m3, the magnitude of the current density vector is Jnev==FHGIKJ××=×−−−8 701016010470106541061937....mCm / sA / m32chch(b) Although the total surface area of Earth is 42πRE(that of a sphere), the area to be used in a computation of how many protons in an approximately unidirectional beam (the solar wind) will be captured by Earth is its projected area. In other words, for the beam, the
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