#electromagnetism — Public Fediverse posts

In 1947, Shockley, Brattain, and Bardeen invented the transistor. #Poetry #Science #History #Electromagnetism #Transistor #Shockley #Brattain #Bardeen (https://sharpgiving.com/Sharp/thebookofscience/items/p1947c.html)

In 1947, Shockley, Brattain, and Bardeen invented the transistor. #Poetry #Science #History #Electromagnetism #Transistor #Shockley #Brattain #Bardeen (https://sharpgiving.com/Sharp/thebookofscience/items/p1947c.html)

Nice between the 72 written exams of #Electromagnetism I am correcting, there's the one of one student who gave it to me and added "but please prof leave it on sunlight for a couple of hours because i have mononucleosis and I just sneezed over it"

🙄

#academia

Nice between the 72 written exams of #Electromagnetism I am correcting, there's the one of one student who gave it to me and added "but please prof leave it on sunlight for a couple of hours because i have mononucleosis and I just sneezed over it"

🙄

#academia

“Photograph of the Od attracted by the state of soul of a child lamenting over a recently killed pheasant.” (1913) by Hippolyte Baraduc, from The Human Soul.

Source: Boston Public Library / Internet Archive

https://pdimagearchive.org/images/14fc5a8b-ea24-40fb-9078-f826f68f582b

#electricity #spirituality #soul #spirits #occultism #death #electromagnetism #auras #windows #sadness #grieving #art #publicdomain

“Photograph of the Od attracted by the state of soul of a child lamenting over a recently killed pheasant.” (1913) by Hippolyte Baraduc, from The Human Soul.

Source: Boston Public Library / Internet Archive

https://pdimagearchive.org/images/14fc5a8b-ea24-40fb-9078-f826f68f582b

#electricity #spirituality #soul #spirits #occultism #death #electromagnetism #auras #windows #sadness #grieving #art #publicdomain

“Photograph of the Od attracted by the state of soul of a child lamenting over a recently killed pheasant.” (1913) by Hippolyte Baraduc, from The Human Soul.

Source: Boston Public Library / Internet Archive

https://pdimagearchive.org/images/14fc5a8b-ea24-40fb-9078-f826f68f582b

#electricity #spirituality #soul #spirits #occultism #death #electromagnetism #auras #windows #sadness #grieving #art #publicdomain

“Photograph of the Od attracted by the state of soul of a child lamenting over a recently killed pheasant.” (1913) by Hippolyte Baraduc, from The Human Soul.

Source: Boston Public Library / Internet Archive

https://pdimagearchive.org/images/14fc5a8b-ea24-40fb-9078-f826f68f582b

#electricity #spirituality #soul #spirits #occultism #death #electromagnetism #auras #windows #sadness #grieving #art #publicdomain

“Photograph of the Od attracted by the state of soul of a child lamenting over a recently killed pheasant.” (1913) by Hippolyte Baraduc, from The Human Soul.

Source: Boston Public Library / Internet Archive

https://pdimagearchive.org/images/14fc5a8b-ea24-40fb-9078-f826f68f582b

#electricity #spirituality #soul #spirits #occultism #death #electromagnetism #auras #windows #sadness #grieving #art #publicdomain

Morning of #Electromagnetism and experiments with high-school students (now on vacation, but willing to know more about #physics!)
All in the laboratories of our department.
#academia #astrophysics #science

Morning of #Electromagnetism and experiments with high-school students (now on vacation, but willing to know more about #physics!)
All in the laboratories of our department.
#academia #astrophysics #science

I wanted a simple but smooth electromagnetic field model of an RF cavity for use in particle tracking. I didn't want to design the whole cavity yet, so assumed a particular on-axis field function and then used Maxwell's equations to give a power series in radius. (I loosely based this on a similar note for magnet fields that I wrote in 2013).
https://stephenbrooks.org/ap/report/2026-9/rffield.pdf
#accelerators #physics #electromagnetism

I wanted a simple but smooth electromagnetic field model of an RF cavity for use in particle tracking. I didn't want to design the whole cavity yet, so assumed a particular on-axis field function and then used Maxwell's equations to give a power series in radius. (I loosely based this on a similar note for magnet fields that I wrote in 2013).
https://stephenbrooks.org/ap/report/2026-9/rffield.pdf
#accelerators #physics #electromagnetism

“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

“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

“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

“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

“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

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

In 1946, Walter M. Elsasser explained that convection in Earth’s outer core creates the magnetosphere. #Poetry #Science #History #Electromagnetism #Earth_science #Magnetosphere #Elsasser (https://sharpgiving.com/Sharp/thebookofscience/items/p1946c.html)

In 1946, Walter M. Elsasser explained that convection in Earth’s outer core creates the magnetosphere. #Poetry #Science #History #Electromagnetism #Earth_science #Magnetosphere #Elsasser (https://sharpgiving.com/Sharp/thebookofscience/items/p1946c.html)

In 1946, Walter M. Elsasser explained that convection in Earth’s outer core creates the magnetosphere. #Poetry #Science #History #Electromagnetism #Earth_science #Magnetosphere #Elsasser (https://sharpgiving.com/Sharp/thebookofscience/items/p1946c.html)

In 1946, Walter M. Elsasser explained that convection in Earth’s outer core creates the magnetosphere. #Poetry #Science #History #Electromagnetism #Earth_science #Magnetosphere #Elsasser (https://sharpgiving.com/Sharp/thebookofscience/items/p1946c.html)

In 1946, Walter M. Elsasser explained that convection in Earth’s outer core creates the magnetosphere. #Poetry #Science #History #Electromagnetism #Earth_science #Magnetosphere #Elsasser (https://sharpgiving.com/Sharp/thebookofscience/items/p1946c.html)

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

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

#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 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

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

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

#Electromagnetism experience of the day in the class: magnetic levitation using a B-field opportunely induced by alternating currents.

(from there, I gave the idea of how levitation works for **trains** , as in the #Maglev https://en.wikipedia.org/wiki/Maglev)

#science #physics

#Electromagnetism experience of the day in the class: magnetic levitation using a B-field opportunely induced by alternating currents.

(from there, I gave the idea of how levitation works for **trains** , as in the #Maglev https://en.wikipedia.org/wiki/Maglev)

#science #physics

Forget about the #SimulationHypothesis and other infections of the mind:

(https://mastodon.social/@franco_vazza/116447021798645275)

here is the joy of rock solid #electromagnetism, which induces parcels of iron to bounce on a plate and align according to the magnetic field lines of two magnets put just below the plate (in todays EM class)

#physics #science

Forget about the #SimulationHypothesis and other infections of the mind:

(https://mastodon.social/@franco_vazza/116447021798645275)

here is the joy of rock solid #electromagnetism, which induces parcels of iron to bounce on a plate and align according to the magnetic field lines of two magnets put just below the plate (in todays EM class)

#physics #science

Another #Electromagnetism lecture, another live experiment: this one is creating the "tomato battery", i.e. using cherry tomatoes to create zinc-copper galvanic cells and power a small electric watch (which needs about 1.5V to work).
the students realise that a single cell is not enough, and a series of two is needed to get enough voltage.

That's the vegan version of the original experiments by Galvani, in which dead frogs were involved..

#physics #science

Another #Electromagnetism lecture, another live experiment: this one is creating the "tomato battery", i.e. using cherry tomatoes to create zinc-copper galvanic cells and power a small electric watch (which needs about 1.5V to work).
the students realise that a single cell is not enough, and a series of two is needed to get enough voltage.

That's the vegan version of the original experiments by Galvani, in which dead frogs were involved..

#physics #science

In my #Electromagnetism lectures yesterday: trying to show the concept of discharge and breaking of a dielectric medium using a "plasma ball".
The innermost part is elevated to a ~10kiloVolt potential by an upward transformation, which is enough to produce plasma sparks in this rarefied medium.
(btw this thing is cool but I tend to break it once a year, which causes a sharp whistle when the mixture of rare gases leaks out - probably radon, krypton & argon)
#science #physics

In my #Electromagnetism lectures yesterday: trying to show the concept of discharge and breaking of a dielectric medium using a "plasma ball".
The innermost part is elevated to a ~10kiloVolt potential by an upward transformation, which is enough to produce plasma sparks in this rarefied medium.
(btw this thing is cool but I tend to break it once a year, which causes a sharp whistle when the mixture of rare gases leaks out - probably radon, krypton & argon)
#science #physics

Here is the "experiment" of today in the #Electromagnetism class: a tiny replica of the Leiden jar which is a far ancestor of the battery, consisting of a distribution of chargers trapped in in a glass container, which acts as a capacitor when the inner and outer conducting layers are reconnected again.

I used a voltmeter to detect the tiny residual voltage (0.4mV) produced across the bottle after the charging process.

#science #physics

Here is the "experiment" of today in the #Electromagnetism class: a tiny replica of the Leiden jar which is a far ancestor of the battery, consisting of a distribution of chargers trapped in in a glass container, which acts as a capacitor when the inner and outer conducting layers are reconnected again.

I used a voltmeter to detect the tiny residual voltage (0.4mV) produced across the bottle after the charging process.

#science #physics

“Major Darget, placing his fingers together, projected his will on a sensitive plate.” (1913) by Hippolyte Baraduc, from The Human Soul.

Source: Boston Public Library / Internet Archive

https://pdimagearchive.org/images/65b2de8e-f9ac-4b7e-8ae5-169f4cba3111

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

“Major Darget, placing his fingers together, projected his will on a sensitive plate.” (1913) by Hippolyte Baraduc, from The Human Soul.

Source: Boston Public Library / Internet Archive

https://pdimagearchive.org/images/65b2de8e-f9ac-4b7e-8ae5-169f4cba3111

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

“Major Darget, placing his fingers together, projected his will on a sensitive plate.” (1913) by Hippolyte Baraduc, from The Human Soul.

Source: Boston Public Library / Internet Archive

https://pdimagearchive.org/images/65b2de8e-f9ac-4b7e-8ae5-169f4cba3111

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

“Major Darget, placing his fingers together, projected his will on a sensitive plate.” (1913) by Hippolyte Baraduc, from The Human Soul.

Source: Boston Public Library / Internet Archive

https://pdimagearchive.org/images/65b2de8e-f9ac-4b7e-8ae5-169f4cba3111

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