- #1
frogthoven
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Hey,
Former physics student here a bit rusty on his electromagnetic and quantum theory. I recall that an electric field in one frame of reference has a magnetic field component in another frame of reference, so E and B field are ultimately products of the same phenomenon (photon exchanges between matter). I also recall that an electromagnetic wave, like visible light, for example, possesses both E and B-field components oscillating orthogonally to one another. And yet EM waves don't interact with, say, a charged particle the same way an electric field does (shining light on a charged sphere doesn't exert a force on it the same way that exposing it to an electric field would). With this in mind, here are my questions:
1) Is there a real distinction, either classically or quantum mechanically, between a magnetic field, as elicited from a moving current, for example, and an electromagnetic field, emanating from some radiating object, if all such fields apparently arise from photons according to the Standard Model?
2) If EM radiation (light, for example) always has both E and B-field components, why don't these components interact with charged matter in the same way the electric field from another charged object does if all three phenomena describe are essentially the same? I know in some frame of reference, one observer's magnetic field is an electromagnetic field for an observer in another frame of reference, and yet I'm still confused as to the apparent discrepancy in how light, X-rays and radio waves (invariant regardless of their frame of reference according to STOR from what I remember), for example, are apparently distinct from what might appear to be a "pure" electric or magnetic field in my frame of reference?
I'd appreciate any insight from those of you who are a bit more up on their physics than I am, and please feel free to point out any invalid assumptions I've made in the questions themselves.
Thanks,
Frogthoven
Former physics student here a bit rusty on his electromagnetic and quantum theory. I recall that an electric field in one frame of reference has a magnetic field component in another frame of reference, so E and B field are ultimately products of the same phenomenon (photon exchanges between matter). I also recall that an electromagnetic wave, like visible light, for example, possesses both E and B-field components oscillating orthogonally to one another. And yet EM waves don't interact with, say, a charged particle the same way an electric field does (shining light on a charged sphere doesn't exert a force on it the same way that exposing it to an electric field would). With this in mind, here are my questions:
1) Is there a real distinction, either classically or quantum mechanically, between a magnetic field, as elicited from a moving current, for example, and an electromagnetic field, emanating from some radiating object, if all such fields apparently arise from photons according to the Standard Model?
2) If EM radiation (light, for example) always has both E and B-field components, why don't these components interact with charged matter in the same way the electric field from another charged object does if all three phenomena describe are essentially the same? I know in some frame of reference, one observer's magnetic field is an electromagnetic field for an observer in another frame of reference, and yet I'm still confused as to the apparent discrepancy in how light, X-rays and radio waves (invariant regardless of their frame of reference according to STOR from what I remember), for example, are apparently distinct from what might appear to be a "pure" electric or magnetic field in my frame of reference?
I'd appreciate any insight from those of you who are a bit more up on their physics than I am, and please feel free to point out any invalid assumptions I've made in the questions themselves.
Thanks,
Frogthoven