Sharks and magnetic fields, trying to learn from nature

[RMF808]

Sharks are extremely sensitive to magnetic fields, attracted by low end frequencies and repelled or overstimulated by higher/stronger fields. I want to map the spectrum in between using and electromagnetic coil in the water with sharks. I have sharks and a boat but need help building the coil. If we can learn to read magnetic fields better, then we may better understand other natural phenomena.

 

[NascentOxygen]

Hi RMF808.

You would do well to research widely to find out what others have been doing in this field, as a guide to directing your own explorations. Because you specifically ask about coils I have moved your thread to Elec Eng, otherwise I would have thought Biology to be the best overall fit.

Good luck! [emoji256] And try not to get bitten.

 

[jim hardy]

Gid you see that PBS "Nature" show ? A fellow had several little sharks in a backyard style above ground swimming pool.. just waving a big magnet near the outside chased them to opposite side.Field made by a coil is pretty well explained at
http://hyperphysics.phy-astr.gsu.edu/Hbase/magnetic/curloo.html
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/solenoid.html

As a detector, a coil will only detect a field that's moving or changing
for a constant field like a magnet
try a search on these words
gaussmeter
magnetometer, hall
magnetometer, fluxgate

there are plenty of hall magnetometer IC's out there, they're inexpensive
fluxgate magnetometer is really sensitive but comparatively complex. a plain compass will be handy for experimenting with coils around your boat

this is the best little book i ever saw for beginners in magnetic experimenting
https://www.amazon.com/dp/B0006QVDJK/?tag=pfamazon01-20
he explains magnetic units
I built his " differential fluxgate magnetometer" , it was amazingly sensitive
but i think you might do as well with a Hall IC based one
probably you can buy a meter already built that's ready to use.

Sounds like fun

old jim