As a field expands and contracts it will effect its surrounding. An inductor has self inductance when the fields from one turn interact with the other turns in the coil. Ifd the field is captured by its neighbors it will release its energy. In the coil energy is absorbed and released back into the circuit.
In an antenna the energy escapes into space and is radiated.
The field would build and collapse. The energy is contained.
If the energy breaks away it is radiated.
Now consider an AC current flowing in a conductor. What determines if it is radiated or not?
In an antenna the energy escapes into space and is radiated.
If the energy breaks away it is radiated.
Now consider an AC current flowing in a conductor. What determines if it is radiated or not?
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