Far from a current loop (), the magnetic field is identical to that of a magnetic dipole: and , where . The ratio (same as an electric dipole). This dipole approximation is useful for understanding the Earth's magnetic field and atomic magnetism.
Part of JMAG-01 — Magnetic Effects: Biot-Savart & Ampere's Law
Magnetic Field of a Current-Carrying Coil as a Dipole
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