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**[SOLVED] Griffiths dipole moment**

**1. Homework Statement**

On page 244 of Griffiths E and M book, Griffiths defines the magnetic dipole moment as

[tex]\vec{m} = I \int d\vec{a} [/tex]. Then in problem 5.58, he asks us to calculate the dipole moment of a uniformly charged spinning solid sphere. How is that compatible with the definition he gave?

It seems like Griffiths derived the formula for the magnetic dipole moment only using line currents not surface or volume currents and then asks us to find the magnetic dipole moments of volume and surface currents. I don't understand how to do that!

**2. Homework Equations**

**3. The Attempt at a Solution**

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