Force from Infinitely Long Cylindrical Magnet on Magnetic Dipole

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Homework Statement



What is the force from an infinitely long cylindrical magnet on a magnetic dipole?

Homework Equations



M=Mz (given in problem)

The Attempt at a Solution



My argument for this solution that since the magnetization is in the z direction and the cylinder is infinitely long, there is no magnetization outside of the cylinder. I believe this is correct, but would like some feedback to make sure :) Thanks!
 
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Perhaps you were expected to make calculations at varying/increasing lengths?
 
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