sharma_satdev
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what is the source of electromagnetic radiation when electron is accelerated
Accelerated Electron: EM Radiation Source
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hi sharma! 
if you mean "where does the energy come from?", the answer is that it comes from whatever force is making the electron accelerate
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when you accelerate an electron, you not only have to give it extra momentum, you also have to supply a bit of work into the electromagnetic field
sharma_satdev said:
if you mean "where does the energy come from?", the answer is that it comes from whatever force is making the electron accelerate
…
when you accelerate an electron, you not only have to give it extra momentum, you also have to supply a bit of work into the electromagnetic field