Timeline for What is the electric field generated by a spinning magnet?
Current License: CC BY-SA 2.5
10 events
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| Mar 23, 2011 at 1:26 | history | edited | Helder Velez | CC BY-SA 2.5 |
ommit the magnet because of confusion with permanent maget
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| Mar 23, 2011 at 1:24 | comment | added | Helder Velez | I will edit my answer to say: a permanent Magnetic Field and will ommit the word magnet. I never sugested "permanent magnetization of the materials in the earth". | |
| Mar 23, 2011 at 1:15 | comment | added | Helder Velez | permanent: Lasting or remaining without essential change. (def on thefreedictionary.com) I said in my answer:"The magnetic field is due to the presence of a relative motion between the charges inside the Earth (electric dipole) and the observer. " I never said different than you. | |
| Mar 23, 2011 at 0:58 | comment | added | Carl Brannen | @Helder Velez; In English, "permanent magnet" implies a material that retains its magnetic field without the addition of any external field (or current). This doesn't apply to the earth's core. See en.wikipedia.org/wiki/Dynamo_theory "It was actually once believed that the dipole, which comprises much of the Earth's magnetic field and is misaligned along the rotation axis by 11.3 degrees, was caused by permanent magnetization of the materials in the earth." And I'm a big fan of Hans de Vries and referenced his paper here: physics.stackexchange.com/questions/6817 | |
| Mar 22, 2011 at 23:59 | comment | added | Helder Velez | @Carl @Georg Which of the 3 words you dont like in? "rotating permanent magnet" an electromagnet is not a magnet? Permanent is not restricted to ferromagnetic materials. They are formed in the already presence of Earth mag.field, that exists since : ".. only 10 million years after the Earth began to form, ..setting up the formation of Earth's magnetic field." I got downvotes everytime I mentioned the Vries doc. It is annoying because no one is saying that it has an error. | |
| Mar 22, 2011 at 0:49 | comment | added | Carl Brannen | @Helder Velez; You might want to edit out the claim that the earth is a rotating permanent magnet. Do any kind of literature search and you'll find otherwise. In fact, it takes incredible amounts of power to keep the temporary field we see in place. | |
| Mar 21, 2011 at 21:03 | comment | added | Georg | ""Lasts for several billions of years"" ? You should read wiki on earth magnetic field. They say that it changes polarity every 300 000 years. The rest of Your comment is below any comment from me. | |
| Mar 21, 2011 at 20:38 | comment | added | Helder Velez | Surely The Earth is a rotating permanent magnet As it lasts for several billions of years and no one can switch it off is a serious candidate to be 'permanent'. Permanent_magnet WP : Ampère model: "where all magnetization is due to the effect of microscopic, or atomic, circular bound currents, ... throughout the material." Being an electromanet or a ferromagnetic material the resultant effect is all the same and the origin of the magnetic field is the same. The Vries doc is not ok? | |
| Mar 21, 2011 at 19:49 | comment | added | Georg | ""The Earth is a rotating permanent magnet "" Aha, what is the ferromagnetic material with high coercitive field down in the core? | |
| Mar 21, 2011 at 19:39 | history | answered | Helder Velez | CC BY-SA 2.5 |