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AP Physics 2
12.1 Magnetic Fields
BeginnerMCQConceptual20.5k
A sphere representing Earth with a magnetic dipole vector centered inside it, aligned vertically. Magnetic field lines loop continuously from the bottom region of the sphere around the outside to the top region. The field lines are drawn densely packed where they enter the top pole and exit the bottom pole, and are spread farther apart along the midsection equator. Point P is labeled on the top surface near the pole where lines are dense. Point E is labeled on the outer side surface at the equator where lines are sparse. No other labels, lines, text, or axes appear.
Earth's magnetic dipole field lines and surface points P and E.
Earth's magnetic field can be modeled as a magnetic dipole located near the center of the planet. Point \(P\) is located on Earth's surface near a magnetic pole, and Point \(E\) is located on the surface along the magnetic equator. Which of the following correctly compares the magnitude of the magnetic field at Point \(P\) (\(B_P\)) to that at Point \(E\) (\(B_E\)) and provides the correct justification?

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