“Iconography produced in April 1894 in the dark, both hands stretched towards the plate.” (1913) by Hippolyte Baraduc, from The Human Soul.

Source: Boston Public Library / Internet Archive

https://pdimagearchive.org/images/d26b84c7-e483-4353-8b5c-84ce8c5bb807

#abstract #electricity #spirituality #soul #spirits #occultism #electromagnetism #auras #art #publicdomain

End of my #Electromagnetism course (for engineers) for this semester!

🫠

I just hated the subject when it was first given to me in 2017, and now it became my favourite one.

Here is a short list (10 in total) of what I think are the fundamental small experiments one can easily do at the desk to show the foundation of EM in action .

(larger collection here https://vimeo.com/showcase/5419982)

#physics #science #teaching

📄 New publication: "Field measurements of environmental dose rate for trapped charge dating"

Field measurements at or close to the sampling position used for dating are the most direct ways of estimating environmental dose rates. They usually happen in undisturbed settings under natural conditions, avoiding extensive post-processing or modelling. Over the last decades, the trapped charge dating community has pr (...)

#Archaeology #Statistics #Electromagnetism

https://doi.org/10.1016/j.radmeas.2026.107663

Very proud of this test, first time ever I make it work: it shows in a nutshell the wireless transmission of a small power via #Faraday induction effect, from one coil to a secondary coil which is connected to a voltmeter.

Both coils have >1e4 windings.

First, I let the primary coil have an intermittent current, but nothing happens on the secondary. After I insert a ferromagnet instead, the transmitted tension to the secondary goes to a few +-0.1V.

#science #electromagnetism #physics

#Electromagnetism experience of today: Faraday induction law in action, look at my baby electric generator (of course I just bought it and assembled, it's a nice today with led bulb)

#physics #science

New #Electromagnetism experiment in the class today: THE fundamental one, i.e. Faraday's discovery of the induction law (~1831) in which a variation of the magnetic field flux across a coil generates a voltage, which the voltmeter can measure (a super tiny one here, i.e. 0.01V or so).

Faraday's induction is no less than the foundation of our technology, from the generation of electricity, to its transformation, to wireless anything. You can even cook with it!

#physics

New #Electromagnetism small experiment in the class: showing the boost in magnetic field on the axis of a solenoid (for a given current I, B scales with the density of winding per unit length) to produce an electro magnet and lift a small neodymium magnet.

#physics #science

In todays experiment of #Electromagnetism in the class:

Faraday's homopolar motor (1821), here using a battery, a magnet and a rigid copper wire.

https://en.wikipedia.org/wiki/Homopolar_motor

(the original experiment involved liquid mercury instead, probably not allowed to use at the uni)

#science #physics