Sharks can sense the electric field perturbation?

AI Thread Summary
Sharks possess the ampullae of Lorenzini, allowing them to detect electric fields as weak as 5*10^-9 V/m. This capability raises questions about their potential to sense vacuum perturbations in electric fields. The method of determining this sensitivity is not clearly defined, though it is referenced across multiple sources. It is speculated that researchers may have used a distant source to test this sensitivity. The discussion highlights the intriguing nature of sharks' sensory abilities in relation to electric fields.
HomogenousCow
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Sharks use an organ known has the ampullae of Lorenzini to sense electric fields, they can sense fields as weak as 5*10^-9 V/m.
Which got me thinking, they should in principle be able to detect vacuum perturbation in the field, interesting?
 
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How did they found out such value?
 
Not sure, but that's what I read on a bunch of websites.
I would assume they had a source at a long distance away?
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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