Suppose that the magnetic dipole moment of Earth is 9.1 × 1022 J/T. (a) If the...

Suppose that the magnetic dipole moment of Earth is 9.1 × 10²² J/T. (a) If the origin of this magnetism were a magnetized iron sphere at the center of Earth, what would be its radius? (b) What fraction of the volume of Earth would such a sphere occupy? The radius of Earth is 6.37 × 10⁶ m. Assume complete alignment of the dipoles. The density of Earth's inner core is 11 g/cm³. The magnetic dipole moment of an iron atom is 2.1 × 10^-23 J/T. Iron has a molar mass of 55.9 g/mol. (Note: Earth's inner core is in fact thought to be in both liquid and solid forms and partly iron, but a permanent magnet as the source of Earth's magnetism has been ruled out by several considerations. For one, the temperature is certainly above the Curie point.)

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genius_generous answered 2 years ago

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Suppose that the dipole moment associated with an iron atom of an iron bar is 1.7...

Suppose that the dipole moment associated with an iron atom of an iron bar is 1.7 × 10-23 J/T. Assume that all the atoms in the bar, which is 7.0 cm long and has a cross-sectional area of 1.1 cm2, have their dipole moments aligned. (a) What is the dipole moment of the bar? (b) What torque must be exerted to hold this magnet perpendicular to an external field of 2.0 T? (The density of iron is 7.9 g/cm3 and...

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Suppose that the magnetic dipole moment of Earth is 9.1 × 1022 J/T. (a) If the...

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