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**1. Homework Statement**

Calculate the magnetic force of attraction between the northern and southern hemispheres of a spinning charged spherical shell. (ex. 5.11)

**2. Homework Equations**

**3. The Attempt at a Solution**

I already looked at this https://www.physicsforums.com/showthread.php?t=42020.

I am stuck figuring out how to proceed. Should I calculate the B-field due to one hemisphere and then integrate over the Lorentz force on the other? Calculating he- B-field due to one hemisphere does not seem fun...

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