= Solution
Near the \b[south magnetic pole], the inducing <magnetic field> and induced <magnetic moment> are vertically upward. Directly over the car its dipole field is also upward, again reinforcing the main field. The <total-field magnetic anomaly> is therefore the \b[same positive central high and weak negative side lobes as at the north magnetic pole] under the same induced-dipole assumptions. A fixed signed vertical field component would reverse, but the scalar field strength measured by the <proton-precession magnetometer> does not. If the car's <remanent magnetization> dominates, neither this symmetry nor these predicted signs is assured.
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