In classical electrodynamics, the dynamic toroidal dipole arises from time-dependent currents flowing along the poloidal direction on the surface of a torus. In relativistic quantum mechanics, spin contributions to the toroidal dipole needs to be taken into account.
In classical electrodynamics, the dynamic toroidal dipole arises from time-dependent currents flowing along the poloidal direction on the surface of a torus. In relativistic quantum mechanics, spin contributions to the toroidal dipole needs to be taken into account.
Source: Wikipedia "Dynamic toroidal dipole" · CC BY-SA 4.0
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