What causes electric and magnetic fields to oscillate, making light?
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I don’t think there’s a good answer. Mathematically we describe EM with Maxwell’s equations but like most things that are scientific theories/laws, they’re based on what we repeatedly observe. This is why scientists and physicists keep on trucking to understand what makes things happen. To me this is a quantum mechanical question but currently QM is based probabilities as we just can observe these interactions.
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