A 'muon' is a particle that has the same charge as an electron but is 200 times heavier than it. If we had an atom in which the muon revolves around a proton instead of an electron, what would be the magnetic moment of the muon in the ground state of such an atom.
Magnetic moment is given as
M = er2w / 2
so, it does not depend upon the mass only on the charge. Thus, it will remain unaffected in this case.