- #1
zenterix
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- Homework Statement
- Below is a small calculation of the magnetic dipole moment of the Earth. It is not clear to me how the values in the calculation were obtained.
- Relevant Equations
- I am not sure what formula is being used below for computing ##\vec{\mu}##.
These calculations are from these notes from MIT OCW's 8.02 "Electromagnetism", on page 27.
We can represent the location of a point ##P## on the surface of the Earth using spherical coordinates
Let the ##z##-axis be the Earth's rotation axis, and the ##x##-axis passes through the prime meridian (that is, the constant zero longitude line passing through Greenwich, UK). Note that the ##x##-axis passes through the equator not Greenwich.
The corresponding magnetic dipole moment of the Earth can be written
Where did these specific angles and also ##\mu_E## come from?
We can represent the location of a point ##P## on the surface of the Earth using spherical coordinates
Let the ##z##-axis be the Earth's rotation axis, and the ##x##-axis passes through the prime meridian (that is, the constant zero longitude line passing through Greenwich, UK). Note that the ##x##-axis passes through the equator not Greenwich.
The corresponding magnetic dipole moment of the Earth can be written
Where did these specific angles and also ##\mu_E## come from?