Skip to main content

Questions tagged [magnetism]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
0 answers
50 views

How did "Gauss's law" get its name?

Did Carl Friedrich Gauss derive Gauss's law? How did the Maxwell equation we call "Gauss's law" become known as that? In class, we went over how you derive it from Coulomb's law, but I don't ...
Dominic Stewart-Guido's user avatar
0 votes
0 answers
60 views

Translation of Cabeo's Philosophia magnetica

Is there a translation of Niccolò Cabeo's work Philosophia magnetica into English (or other modern language)? The original text in Latin is available for example here but I can't find any translation (...
maxbo's user avatar
  • 1
3 votes
1 answer
141 views

"Équation de Maxwell-Thomson"

In French, Gauss' law for magnetism (no magnetic monopoles) is, sometimes at least, referred to as Équation de Maxwell-Thomson. What is the historical justification of this?
John's user avatar
  • 33
1 vote
0 answers
83 views

Who produced the first permanent horseshoe magnet: Johann Dietrich or Gilles-Augustin Bazin?

Several recent sources state that the first known permanent horseshoe magnet was produced by the instrument maker Johann Dietrich of Basel, probably in 1743. However, several older French sources ...
linguisticturn's user avatar
5 votes
0 answers
90 views

Permanent horseshoe magnet: primary sources of information about its invention? (Johann Dietrich and Daniel Bernoulli)

There seems to be general agreement that the first known horseshoe magnet (permanent, not electromagnet) was produced by the instrument maker Johann Dietrich of Basel, probably in 1743. Dietrich also ...
linguisticturn's user avatar
3 votes
1 answer
194 views

Aristotelian explanation of magnetism

How did Aristotle explain magnetism? As far as I know, there were only 7 postulates in Aristotelian mechanics: The first hypothesis Earth is the center of the universe. Second hypothesis All material ...
GedankenExperimentalist's user avatar
0 votes
0 answers
93 views

Who introduced the difference between magnetic fields in matter? $\mathbf H$ vs $\mathbf B$

In magnetism, there are two different magnetic fields, that I will simply call $\mathbf B$ and $\mathbf H$. The distinction is not always clear. In experiments $\mathbf H$ is the applied field while $\...
Mauricio's user avatar
  • 3,937
5 votes
2 answers
1k views

How did Stern or Gerlach, of Stern-Gerlach experiment, create individual silver atoms? How were they accelerated?

How, a century ago, could Stern and/or Gerlach KNOW that they had created single silver atoms? How were they moved, or accelerated?
Kurt Hikes's user avatar
1 vote
1 answer
78 views

First occurrence of the Langevin function in scientific literature

The Langevin function $\mathcal{L}(x) = \mathrm{coth}(x) - \frac{1}{x}$ is named after the French physicist Paul Langevin (1872-1946). The Wikipedia article on the Brillouin and Langevin functions ...
njuffa's user avatar
  • 6,704
2 votes
0 answers
80 views

How was it discovered that the Magnetic force was orthogonal to the B-field and the velocity of the charged particle?

Forces like the gravitational and the electric force are in the direction of the force field. Why is it that the magnetic force is orthogonal to the velocity of the charge and the magnetic field? Was ...
Aaroh Gokhale's user avatar
2 votes
0 answers
80 views

Who originally worked out the magnetic field produced by a solenoid and toroid?

Although, it seems very easy to find the magnetic field produced by a solenoid or a toroid, all we got to do is to make a suitable an Amperian Loop and take the $\mathbf B$ out of the integral and so ...
Knight wants Loong back's user avatar
8 votes
1 answer
760 views

Historical origin of magnetic monopoles

There are two related historical questions that I'm trying to find answers to: Who was the first to introduce the concept of magnetic monopoles? Griffiths in his textbook Introduction to ...
Ivica Smolić's user avatar
5 votes
2 answers
496 views

Has anything survived of the work of alleged science journalist and medical doctor 'Adolph Klein', allegedly born 1829 in Merseburg?

The Jewish Encyclopedia (https://en.wikipedia.org/wiki/Jewish_Encyclopedia) contains a sizeable entry on one 'Adolph Klein', allegedly born on 1829-05-29 in ther German city of Halle (Saale). ...
Peter Heinig's user avatar
0 votes
0 answers
65 views

How did people in pre-Ampere period deduce this?

How did people before Ampere (eg-Coulomb) who used magnetic-pole model, know that only two surfaces (north and south poles) of a bar magnet exerts and experiences force while the rest of the surfaces ...
lorilori's user avatar
  • 101
3 votes
2 answers
193 views

Who determined whether surfaces between magnetic poles attract/repel or whether the poles' volumes do?

NOTE: I am talking about the period before electricity and magnetism were unified. So I am not seeking for answers based on Ampere atomic current model of magnets. Who first figured out that one of ...
Joe's user avatar
  • 181
0 votes
1 answer
78 views

History of Magnetism before the Hubbard model

I'm interested in models used before the Hubbard model (free electron model, band model, etc, both itinerant and localized models). What were their strengths and weaknesses? Which model is currently ...
user avatar
3 votes
2 answers
881 views

Why is Maxwell and not Ampère credited for unifying electricity and magnetism?

Ampère, a half century before Maxwell, theorized that magnetism was caused by electrical currents. So, why is Maxwell and not Ampère credited for unifying electricity and magnetism? (cf. the question ...
Geremia's user avatar
  • 5,371
0 votes
0 answers
38 views

Poincaré and magnetic field

Recently somebody said in answer (at PSE) that magnetic force violates 3rd law of motion and that Poincaré solved that anomaly introducing the magnetic field that compensates missing force. Can you ...
user avatar
4 votes
2 answers
210 views

What was taught in 19th century European electricity and/or magnetism courses?

What topics were taught in late-19th century electricity and/or magnetism courses in Europe?
Geremia's user avatar
  • 5,371
4 votes
2 answers
395 views

What did Einstein learn in his university electricity and magnetism courses?

What did Einstein learn in his university electricity and magnetism courses? Did he learn about such prominent results as Ampère's force law, Weber's force law derived from it (cf. Maxwell's Treatise §...
Geremia's user avatar
  • 5,371
4 votes
1 answer
197 views

What is the earliest mathematical formula describing magnetism?

What is the earliest formal equation of magnetism? The history of discovery of magnetism can trace back to Thales of Miletus. Although many people had discovered, they did not formalize an equation.
user2986288's user avatar
7 votes
2 answers
4k views

Why is magnetic flux density named after Nikola Tesla?

I have my respect for Mr Tesla, but it seems weird that "he" was chosen to be the units of magnetic flux density. I mean, he didn't contribute much to magnetic fields theory, nor did he work ...
Eminem's user avatar
  • 181
10 votes
1 answer
172 views

Discovery of magnetic field reversals?

Inspired by the question Discovery of Earth's magnetic field, the article from New Zealand's webpage Discovery of the Earth’s magnetic field, also states that The earth's dynamo is unstable, as is ...
user avatar
15 votes
3 answers
1k views

Discovery of Earth's magnetic field

Compasses are used for various reasons since the 2nd century BC, and for navigation in particular since the 11th century. When did people realize that the reason it indicated North have something to ...
plannapus's user avatar
  • 1,390