Figure 2. Suppose there are two current elements, one is equivalent to a primary coil of a transformer, releasing energy, and another is equivalent to a secondary coil of a transformer, absorbing energy. Both current elements generate their own electromagnetic fields

From

Energy Flow and Photons from Primary Coil to Secondary Coil of Transformer

Shuang-ren Zhao

International Journal of Physics. 2023, 11(1), 24-39 doi:10.12691/ijp-11-1-4