13.11 Lunar Magnetism The Moon has no magnetic field outside of itself, despite the observed permanent magnetization of rocks collected by lunar missions. One explanation supposes that the Moon once had a geodynamo (like the Earth) confined to a core region ($r < b$) that produced a dipole field everywhere outside the core. As a result, the lunar crust ($b \le r \le a$) became permanently magnetized proportional to (and parallel to) the local dipole field. Later, the geodynamo ceased, along with its dipole field. Show that the still-present magnetization of the crust produces zero magnetic field outside the surface of the Moon. Sketch the lines of $B(r)$ inside the Moon.
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The still-present magnetization of the crust means that there is a magnetic field present within the Moon's crust. This magnetization could be due to the alignment of magnetic minerals within the rocks. Show more…
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