Figure 1. There are primary coil and secondary coil, from that the law of Faraday induction is developed.

From

The Paradox that Induced Electric Field has Energy in Maxwell’s Theory of Classical Electromagnetic Field is Shown and Solved

Shuang-ren Zhao

International Journal of Physics. 2022, 10(4), 204-217 doi:10.12691/ijp-10-4-3