Superconductor Flux pinning/Meissner effect with electromagnets?

AI Thread Summary
The discussion centers on the Meissner effect in high-temperature superconductors, specifically whether it applies to electromagnets as well as permanent magnets. It is noted that the mechanism generating the magnetic field does not affect the superconducting behavior. The inquiry seeks to understand if the expulsion of magnetic fields occurs similarly with electromagnets. The consensus suggests that the underlying principles are consistent regardless of the magnetic source. Insights into this topic emphasize the universality of the Meissner effect across different types of magnets.
BigDogPhysics
Messages
1
Reaction score
0
I was reading about high temperature superconductors expelling magnetic fields (Meisner effect). I was curious if this only works with permanent magnets or is there similar effects with electromagnets. I assume since the magnetic waves would be similar there would be a similar reaction, but everything I read or experiments involve permanent Earth magnets. Any insights would be appreciated!

Alex
DePaul University
 
Physics news on Phys.org
What mechanism that generates the magnetic field makes no difference if that is what you are asking.
 
This is from Griffiths' Electrodynamics, 3rd edition, page 352. I am trying to calculate the divergence of the Maxwell stress tensor. The tensor is given as ##T_{ij} =\epsilon_0 (E_iE_j-\frac 1 2 \delta_{ij} E^2)+\frac 1 {\mu_0}(B_iB_j-\frac 1 2 \delta_{ij} B^2)##. To make things easier, I just want to focus on the part with the electrical field, i.e. I want to find the divergence of ##E_{ij}=E_iE_j-\frac 1 2 \delta_{ij}E^2##. In matrix form, this tensor should look like this...
Thread 'Applying the Gauss (1835) formula for force between 2 parallel DC currents'
Please can anyone either:- (1) point me to a derivation of the perpendicular force (Fy) between two very long parallel wires carrying steady currents utilising the formula of Gauss for the force F along the line r between 2 charges? Or alternatively (2) point out where I have gone wrong in my method? I am having problems with calculating the direction and magnitude of the force as expected from modern (Biot-Savart-Maxwell-Lorentz) formula. Here is my method and results so far:- This...
Back
Top