Magnetic dipole–dipole interaction

Magnetic dipole–dipole interaction, also called dipolar coupling or dipolar interaction, refers to the direct interaction between two magnetic dipoles. Roughly speaking, the magnetic field of a dipole goes as the inverse cube of the distance, and the force of its magnetic field on another dipole goes as the first derivative of the magnetic field. It follows that the dipole-dipole interaction goes as the inverse fourth power of the distance.

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