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  1. Magnetic Dipole

    Linked via "electric dipole radiation"

    $$ P = \frac{\mu_0}{6\pi c} \left| \frac{d^2\mathbf{m}}{dt^2} \right|^2 $$
    The efficiency of this radiation mechanism is often compared against electric dipole radiation, where the magnetic contribution is typically much smaller unless the characteristic length scales involved are extremely small relative to the wavelength of the radiation.
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