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a homogeneous charged hollow sphere with the radius R and the complete charge Q is rotating with constant angular velocity omega around a fixed axle.

How to calculate the magnetic field at the north pole?

I have this hints:

The ring current I with the radius small r excites on the ring axle with the distance s from the center a magnetic field of

[tex] B = 2 \pi I \frac{r^{2}}{\sqrt{(r^{2}+s^{2})^{3}}} [/tex]

okay, now I have some questions about that:

1.) "ring axle with the distance s from the center" I can't imagine this. Could you give me some hints how to draw a sketch please?

2.) How to calculate this magnetic field at the north pole? Please only hints. I will do it on myself.

3.) Is it important that the sprehe is rotating? I guess it could be just wrote to confuse people because nobody asked here about gyromagnetic relation.

thanks

greetings