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Neutrons have a magnetic dipole moment due to the motion of their internal charged structure (quarks). However, there is no evidence yet of an Electric dipole moment. The existence of an electric dipole would violate parity.

Theoretically, there is more to the neutron (and all hadrons) than just 3 quarks. There are also the gluons and a 'sea' of valance quarks popping in and out of existence.

Interestingly, if you sum up the masses of the up and down quarks in a neutron (2 down, 1 up) you don't get anywhere near the measured mass of the neutron itself. The gluons holding the quarks together are individually massless. However, their binding energy is what makes up the majority of the mass of the neutron (E = mc^2). A bit off topic, but it shows that there's more going on in the neutron than the simple 3 quark diagrams shown in many text books.

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Q: Do neutrons have a dipole arising from its one positive and two negative quarks?
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