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Originally Posted by lyndonashmore
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Originally Posted by papageno
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Originally Posted by lyndonashmore
So what is the 'drift' velocity in ac. You have given it for DC but resorted back to this 'charge density term for ac. An ac currect switched on for 0.00001s must be like a dc so there must be an equivalent ac drift velocity.
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There is no drift velocit in AC, because the external electric field oscillates.
Unless, of course, you observe the system of time-scale much longer that the average scattering time, but much shorter that the period of the AC oscillation.
Now, let's get back to IG plasma, and explain why you do not provide your full calcuations to show us that you are right. |
OK I agree,
You know, we know, the 'drift velocity' in ac is time dependent and shm you just won't admit it. |
The drift velocity is the combined effect of the accelerating electric field and the scattering of electrons, which works like a viscous friction.
An electron is oscillating about a trajectory, but is zipping from scattering event to scattering, drifting slowly in the direction of the accelerating force.
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Originally Posted by lyndonashmore
I gave my answer numerically to Sylas and showed where he went wrong in detail. As I always do.
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Where?
Definitely not in the last two pages.
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Originally Posted by lyndonashmore
The point I have just made with yourself is that it is what happens between collisions that matters because in IG space the electrons dion't make any during one cycle.
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Except that your "theory" is based on electron-photon scattering, not on the effect of a macroscopic EM wave on an electron (maybe you still do not realize the difference).