The magnetism of a magnet is due to

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(A) The magnetism of a magnet is primarily due to the spin motion of electrons. Each electron in an atom revolves in an orbit around the nucleus, whic

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The spin motion of electrons

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(A) The magnetism of a magnet is primarily due to the spin motion of electrons. Each electron in an atom revolves in an orbit around the nucleus, which is equivalent to a tiny current loop, creating an orbital magnetic dipole moment $\vec{M}_{l} = 	ext{current} 	imes 	ext{area}$.In addition to orbital motion, every electron possesses an intrinsic spin motion around its own axis, which generates a spin magnetic dipole moment $\vec{M}_{s}$. The net magnetic dipole moment $\vec{M}$ of the atom is the vector sum of $\vec{M}_{l}$ and $\vec{M}_{s}$. Since $\vec{M}_{s}$ is significantly greater than $\vec{M}_{l}$, the magnetism of a magnet is predominantly attributed to the spin of electrons.

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