Under what conditions will this substance be: a) a diamagnet; b) a paramagnet; c) a strong magnet?

a) if the total magnetic field created by all the electrons of the atom, in the absence of an external field, is equal to zero, then the substance consisting of such atoms will be a diamagnet; b) in a paramagnet, the total magnetic field of all electrons of an atom in the absence of an external field is different from a bullet one; c) in strong magnets, the sum of the induction vectors of the spin magnetic fields of the electrons of its individual atom is nonzero.

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