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Questions tagged [magnetism]

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6
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2answers
161 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). ...
-1
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0answers
29 views

How did Thomson find the value of magnetic force?

In 1881 Thomson discovered the value of magnetic force as v/2 x B. Can you describe his experiment and, possibly, the reason of his mistake.
0
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0answers
47 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 ...
2
votes
2answers
79 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 ...
0
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1answer
43 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 ...
3
votes
2answers
222 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 ...
0
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0answers
23 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 ...
4
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2answers
89 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?
3
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1answer
94 views

What did Einstein learn in his university E&M 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 §...
4
votes
1answer
134 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.
4
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2answers
1k views

Why is magnetic flux 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. I mean, he didn't contribute much to magnetic fields theory, nor did he work with them a lot. ...
9
votes
1answer
85 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 ...
14
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3answers
417 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 ...