- #1
Miyz
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Hello :)I was working on a project for one of my classes, and it had to do with electromagnets + magnet's B field interactions(A simple demonstration of a few laws of electromagnetism).
Basically its a simple configuration like this random photo I found:
http://img577.imageshack.us/img577/353/duallayercoilforcounter.jpg
Where you can see a permanent magnet and a coil(that we can consider as an electromagnet for the sake of illustration).
Ok, I was thinking about lenz's laws, started to think deeply about counter-EMF more and more.
Based on the configuration you see in the image:
1) In order for the C-EMF to be generated, does the magnet need to pass through the whole electromagnet? Or that's not necessary? If the magnet was rotating or moving near by the coil still C-EMF would be generated?
2) Imagine the magnets where on a mobile cart that has low friction as possibile. The B field created by the electromagnet(Em1) is weaker than of the permanent magnet(Pm1). In theory if the magnet was in motion near by the electromagnet the C-EMF would be higher than the input EMF, thus the total current flow would be zero or a negative. Due to the greater C-EMF. Now the question is the following: Although Em1's B field is weaker than Pm1's field... Can Em1 still attract/repel Pm1? Without consuming more energy from the power source.
I believe Em1 can do so... It can attract Pm1 and move the cart closer/farther depending on the type of magnetic force applied.
Hope that I made good sense
Thank you!
Miyze,
Basically its a simple configuration like this random photo I found:
http://img577.imageshack.us/img577/353/duallayercoilforcounter.jpg
Where you can see a permanent magnet and a coil(that we can consider as an electromagnet for the sake of illustration).
Ok, I was thinking about lenz's laws, started to think deeply about counter-EMF more and more.
Based on the configuration you see in the image:
1) In order for the C-EMF to be generated, does the magnet need to pass through the whole electromagnet? Or that's not necessary? If the magnet was rotating or moving near by the coil still C-EMF would be generated?
2) Imagine the magnets where on a mobile cart that has low friction as possibile. The B field created by the electromagnet(Em1) is weaker than of the permanent magnet(Pm1). In theory if the magnet was in motion near by the electromagnet the C-EMF would be higher than the input EMF, thus the total current flow would be zero or a negative. Due to the greater C-EMF. Now the question is the following: Although Em1's B field is weaker than Pm1's field... Can Em1 still attract/repel Pm1? Without consuming more energy from the power source.
I believe Em1 can do so... It can attract Pm1 and move the cart closer/farther depending on the type of magnetic force applied.
Hope that I made good sense
Thank you!
Miyze,
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