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## Homework Statement

There is a sphere of magnetic material in a uniform magnetic field [itex]\vec H_0=H_0\vec a_z[/itex],

and after some calculations I got the magnetic moment vector [itex]\vec M_0=M_0\vec a_z[/itex], where [itex]M_0[/itex] is something that isn't important to my question. I am unsure if this magnetic moment vector is correct, as I am running into trouble when I try to figure out the equivalent volume current on the sphere:

[itex]\vec J_{mv}=\nabla\times\vec M_0[/itex],

Is it possible for me to take the curl of a Z-vector, in spherical coordinate system?

Edit: I made a mistake in the title, I meant to take curl of Z, not cross with unit normal of surface of the sphere. Sorry!

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