The discussion revolves around calculating the diameter of a quadrature coil array needed to achieve a generated electromagnetic (EM) field that rotates at the speed of light for a specified frequency. Participants explore the implications of this concept, including the nature of rotation in electromagnetic fields and the relationship between frequency and diameter.
Participants express multiple competing views regarding the relationship between frequency, diameter, and the concept of rotation in electromagnetic fields. There is no consensus on the interpretation of the original question or the implications of the calculations presented.
Participants note that the terminology used may lead to misinterpretation, and there are unresolved questions about the physical meaning of "rotation" in this context. The discussion also touches on the limitations of applying theoretical concepts to practical scenarios involving coil design and energizing rates.
The sides of the coils would share the same physical space, they would be inductively coupled, yet would have quadrature currents.Fluxation said:For example in the case of a cubical array made of square coils.
Just to mention the radiation mechanism from this structure. Irrespective of any rotating fields, radiation occurs due to the acceleration of the electrons in the wire. As the electrons are accelerated in the circular path of the wire, radiation is maximum in the plane of the coils. In this direction there is only plane polarisation, being the simple addition of the radiation fields from each coil. If the coils are spaced by a significant part of a wavelength and driven with a phase difference then we will see a directional pattern but still in the plane of the coils and plane polarised.Baluncore said:The sides of the coils would share the same physical space, they would be inductively coupled, yet would have quadrature currents.