What is a magnetic field made of

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Magnetic fields are fundamentally composed of energy and can be understood as photon fields, according to modern physics. They are essentially relativistic electric fields, and quantum electrodynamics allows for the quantization of the electromagnetic field as a photon field. While some interpretations suggest that magnetic fields consist of virtual photons, this can be misleading. A solid understanding of magnetic fields requires foundational knowledge in electromagnetism and relativity, making it essential to start with basic texts like Halliday & Resnick. A comprehensive grasp of the subject is not achievable through brief explanations alone.
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i want to know more about magnetic fields and what their made of
 
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According to modern physics, magnetic (and electric) fields are photon fields, therefore magnetic fields are made out of energy.
 
Magnetic fields are just relativistic electric fields. And quantum electrodynamics says that the electromagnetic field can be quantized as a photon field. I guess you could say the field is made out of virtual photons (though I wouldn't quite put it that way).
 
I was wondering that too. Some people with particle phyics knowledge told me that it is made up of photons, confusing me further, as i have read somewhere that photons move with a constant velocity
 
If you are really interested in learning about magnetic fields you need to start at the beginning. It just does not make sense to start with the explanations provided by relativity, when the beginner has no idea of either electromagnetism or relativity.

Unfortunately there is no 2 sentence, or even 2 page explanation which can do the subject justice. I would recommend that you find a used copy of something like Halliday & Resnick. Start at the beginning of the Electromagnetism section and read carefully. If you do not have a math background which includes calculus then you may find the reading difficult.
 
I was using the Smith chart to determine the input impedance of a transmission line that has a reflection from the load. One can do this if one knows the characteristic impedance Zo, the degree of mismatch of the load ZL and the length of the transmission line in wavelengths. However, my question is: Consider the input impedance of a wave which appears back at the source after reflection from the load and has traveled for some fraction of a wavelength. The impedance of this wave as it...
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