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Results tagged with electromagnetism
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user 740
The kind of magic without which all of this wouldn't be possible. This tag should be used for questions about the **physics** of the fields that charged particles create and how these fields interact. It should not be used for all questions involving electromagnetism; that would be everything on the site.
3
votes
How to build a constant magnetic field source for a "railgun"?
There is a configuration of two coils, known as a Helmholtz coil, that is supposed to produce a nearly uniform field. The idea is to have two coils that are separated by a distance about the same as t …
- 19.3k
7
votes
Electromagnet design
Assuming this is a DC application, wind as many turns as you have room for.
The reason being, magnetization is the product of the number of turns and the current through them. If you double the numbe …
- 19.3k
13
votes
Accepted
Can a magnet be an antenna?
The field from a permanent magnet is the magnetic equivalent of DC; zero frequency. It shouldn't bother a bit, in terms of receiving. Now if you were transmitting through it, you might degauss it, but …
- 19.3k
3
votes
Will a faster rate of change of flux improve electricity generation?
Induced voltage is proportional to the rate of change of magnetic flux, so to get more voltage, you can either use faster rotation, stronger magnets, or both.
Be aware that a number of things can go …
- 19.3k
11
votes
Putting far more mechanical energy into a generator than its electrical load
If you have a 100W electrical load and you drive 100W plus efficiency losses, say 110W, into the generator, things will be in a state of equilibrium, with 100W being converted from mechanical input po …
- 19.3k