Timeline for What is the source of Earth's magnetic field?
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 26, 2020 at 16:40 | comment | added | jumpjack | this answer sounds like "Earth magnetic field is possible thanks to perpetual motion". | |
| Oct 8, 2011 at 21:56 | comment | added | Ron Maimon | How does this not violate Lenz's law? | |
| Aug 25, 2011 at 2:42 | vote | accept | M.Sameer | ||
| Aug 24, 2011 at 23:49 | comment | added | jdm | Aaah, right, that makes sense. The energy for the field comes from the rotation. This reminds me of a perpetuum-mobile-attempt I came up with as a kid. Placed on a magnetic pole of the earth, it would rotate (thru the earth's rotation) in the magnetic field, and generate electricity. My physics teacher couldn't tell me why it wouldn't work, or where the energy would come from. Months later I realizes it would slow down the earth's rotation, albeit by a tiny amount. | |
| Aug 24, 2011 at 22:57 | comment | added | user1631 | @jdm, that's not a stupid question. In this case the cause of the induced current is both a magnetic field and the motion of the conductor. In fact the current will result in a net force opposing the motion. | |
| Aug 24, 2011 at 21:57 | comment | added | jdm | This may be a stupid question, but why does the induced current generate a magnetic field that reinforces the original magnetic field? I though that Lenz's rule states that the induced current will always counteract its cause? | |
| Aug 24, 2011 at 21:32 | comment | added | endolith | @M.Sameer: The Earth's magnetic field doesn't cancel the magnetic field of the Sun. It just diverts the solar wind. | |
| Aug 24, 2011 at 21:30 | comment | added | endolith | The seed field could be just random variation? Or does the magnetic field of the Sun/galaxy seed the fields of other planets? | |
| Aug 24, 2011 at 20:17 | comment | added | M.Sameer | The seed field might be the magnetic field of the sun but what we have today is that the magnetic field of earth cancels that of the sun in a way to protect the us from the solar wind. So I do not know how the induced field cancels the originating seed field and still sustain itself. | |
| Aug 24, 2011 at 18:16 | history | answered | user1631 | CC BY-SA 3.0 |