For producing an electromagnetic field, would you require photon to have mass??
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Originally Posted by Profpat  Hi Dipayankar; I found this information regarding the photon in Wikipedia:
Rather, the photon seems like a point-like particle, since it is absorbed or emitted as a whole by arbitrarily small systems, systems much smaller than its wavelength, such as an atomic nucleus (≈10–15 m across) or even the point-like electron. Nevertheless, the photon is not a point-like particle whose trajectory is shaped probabilistically by the electromagnetic field, as conceived by Einstein and others; that hypothesis was also refuted by the photon-correlation experiments cited above. [32] According to our present understanding, the electromagnetic field itself is produced by photons, which in turn result from a local gauge symmetry and the laws of quantum field theory (see the Second quantization and Gauge boson sections below). So unless you can give me more information that a photon can be viewed as a dimensionless point particle, I'm going to stay with my Idea that a 1 dimensional planck lenghth string is the most fundamental of " REAL " entities. If you or any of our members have information to the contrary, please let me know. Best to all, Pat |