Why does the magnetic moment of a nucleon line up with a uniform magnetic field?

enfield

I thought the external magnetic field had to vary within an object in order for that object's magnetic moment to line up with the field.

marcusl

Classically, a magnetic moment experiences a torque when in an external magnetic field that forces it to line up with the field. This applies to nuclear moments as well.

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enfield	Why does the magnetic moment of a nucleon line up with a uniform magnetic field? Tweet I thought the external magnetic field had to vary within an object in order for that object's magnetic moment to line up with the field.

marcusl Recognitions: Science Advisor	Classically, a magnetic moment experiences a torque when in an external magnetic field that forces it to line up with the field. This applies to nuclear moments as well.