All Questions
Tagged with superconductivity electric-current
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Induced current in a superconductor
I was recently solving a problem from Jaan Kalda's handouts;
Parallel to and at a distance $h$ above the surface of an infinite planar superconductor is an
infinitely long straight wire with current $...
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Is there a way to quickly change the current in a superconducting loop?
In rocket designs such as VASIMR, superconducting nozzles are frequently used to focus the resulting plasma jet. This leaves out the question of TVC control mandatory in chemical rocket engines, and ...
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Ideal Superconductor connected to Zero Voltage
If an ideal superconductor was just left alone, with no potential difference, what would be the current flowing in it?
According to Ohm's Law, $V = IR$
Hence, if a superconductor of $0\Omega$ ...
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Superconducting rod/slab in an electric field
We have an uniform electric field E in the vertical direction andwe have a rod of superconducting material in the field. Since there is an electric field there will be a current in the material till ...
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Are YBCO or BSCCO rods able to superconduct at full $J_{c}$?
My understanding of the state of the art for superconducting cables is that ceramic powder is manufactured, then it's packed very tightly into a silver tube. I'm not sure how this is supposed to solve ...
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How to correctly measure critical current density in superconductors?
In my experiments, I measure the critical currents of superconductors, and by dividing them by the cross-section areas, I derive the critical current densities. I've also seen colleagues doing the ...
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Problem understanding the London Equation in superconductors
I'm facing quite a lot of issues trying to understand the reasoning, that leads to the London equations in superconductivity. In many places, the logic seems somewhat circular.
I've followed the ...
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Will I get a shock holding a superconductive wire?
Assume a current carrying superconductive wire is in front of me, with no voltage source attached.
If I hold it, will I get a shock? Forget for a minute that the superconducting wire will be too cold ...
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What are good references to understand how Cooper pairs transport charges in superconductors?
I am trying to get a deep understanding of superconductors (in the BCS treatment) and I am now focusing on a detailed description of charge flow in superconductors. I have managed to find some partial ...
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Help in understanding superconductivity?
I am a high school student doing a science project in superconductivity. My knowledge in physics is hence not pretty advanced but I am doing my best to understand the subject. What I find really ...
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Which force causes eddy current in a perfect conductor / superconductor plane?
As far as I know,
Electric and magnetic field inside a perfect conductor plane are zero (it can be proved by combination of Ohm's law and Faraday's law of induction).
When there is a magnetic field, ...
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London equation problems
London's acceleration equation.
$$E=\frac{m}{ne^2} \frac{DJ}{dt}$$
is derived from the definition of current density and $F = ma$
However, why is the magnetic contribution of force ignored for the ...
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Infinite current density inside superconductor
Context: It is commonly stated (such as in Tinkham's "Introduction to Superconductivity") that the current in a superconducting wire is concentrated in a layer around the surface of ...
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Why the electric field inside a superconductor is always zero?
Recently I have been reading the book called "Superconductivity, Superfluids and Condensates" from James F. Annett. I was confused by the expression that
zero electric field at all points ...
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How does too much current 'kill' a type-2 superconductor?
I recently saw this post: Can a superconducting wire conduct unlimited current?
One of the responses mentioned the Meissner effect. However, I am aware that this occurs primarily in type-1 ...
