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how can I calculate the force between two permanent magnetized spheres(each r in radius) and has a magnetization (M) when they are magnetically stuck together with unlike poles touching??

I tried to think about it and found the following:

1) I can treat it like earth magnetic field and imagine there is a bar inside the sphere.

2) because there is no distance between the spheres I must calculate the force for one sphere then multiply it by 2.

3) the formula must have the M,V, meu( permeability of free space). but I can't find such formula which give me the right result ( yes I have the answer in number, it is GRE question)

thanks in advance.

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# Homework Help: About magnetized spheres

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