Recent content by lagrangman

Thanks, very helpful.

Isn't the first row of the dirac equation $$i\frac{\partial \psi_1}{\partial t} = m \psi_1 - i \frac{\partial \psi_4}{\partial x} - i \frac{\partial \psi_4}{\partial y} - i \frac{\partial \psi_3}{\partial z}$$ I was under the impression that ##\psi_1## and ##\psi_2## were matter and ##\psi_3##...

I'm new to relativistic quantum mechanics and quantum field theory and was trying to learn about the Dirac equation. Unfortunately, I got a little stumped by the interaction between matter and antimatter. It seems like the time derivative of matter is dependent on the spatial derivative of...

I was playing with the Schrödinger equation and realized that it can be interpreted as a flow equation. If we set $$ \psi = A e^{i \theta} $$ We can put the Schrödinger in the form ∂ψ∂t=(−∇ψ)⋅v+iEψ If v=ℏθm and E=ℏ2m(−∇2AA+∇2θ)+ρV I find this intuitive personally as it shows that the...

I got it from here: https://www.physicsforums.com/threads/flux-linkage-in-inductance-calculation-for-single-wire.819129/ Sorry about the red herring and thank you for your time, but I think I figured it out. When people say fraction of current in this context, they mean I_enclosed/I_total. I...

Thanks for the response, however I am still confused. Where does the contributing current factor in then? Hopefully this isn't a copyright violation, but Chang writes, "the flux linkages dλ per meter of length, which are caused by the flux in the tubular element, are the product of the flux...

Hello all, Apologies if this has already been asked before, but I tried researching this question for a while with no results. I was reading Grainger's Power System Analysis' derivation of the inductance of a single wire and got confused by his definition of magnetic flux linkage. He seems to...

Thanks for the help, but I am still confused. I used 765 kV as an example, since I live in California and there are no 765 kV lines due to the size. My main question is why does an increase in voltage correspond to a massive increase in transmission tower size? As for when one line is shorted...

Why are ground clearances so large for 765 kV towers? I did a little research on this and even if the switching surge factor is 3 and you have a factor of safety of 1.5, in air (3 kV/mm), it corresponds to 1.62 m of maximum arc length, which doesn't explain why towers are so large. According...

Thanks a lot for the help. I did see that website, but it did not seem to specify whether the E-fields were radial (-∇V) or axial (##-\frac{1}{c}\frac{dA}{dt}##) or how they were calculated. I will definitely read up on it more.

So if a power line is at 12 kV rms (amplitude of 17 kV) single line Earth return, with a pole height of 20 meters, would the max radial E-field be approximately 850 V/m? Also, how would I go about calculating the three phase E-field at near layman's ground? Thanks a lot for your help so far.

Yes, I want the E-field near ground (as in the laymans ground). I was thinking for AC, but I figured it is low enough frequency that the max radial E-field would be the same as DC.

I was trying to calculate the EMFs from power lines, just to see how they correspond to transmission line right of ways, and got a little stuck calculating the electrostatic E-field (-∇V) from power lines. I know it is dependent on the charge distribution on the power line, which is in turn...