Recent content by Magnetosphere

Yes the wires produce a magnetic field while the current is there, but the mass of the wires compared to the mass of the disk is minuscule and the produced magnetic field in the wires will not affect the disk nor the compass in any way. This time the readings with the compass were done with the...

Hey, yeah, to me it is basically the same thing when it is turned on and turned off, the iron in the steel is magnetized and keeps its magnetic forces aligned for a while after current is off. I need to know the behavior, where is the south pole/north pole mainly. It appears that my drawing...

I only gave the disk a few short bursts of current and used the compass after, since brass is not magnetic the magnetism can only come from the iron. I did place the compass closer to the axis (#106... it seemed to loose it's "grip") when I moved it away from the axis it wanted to follow the...

Good observation, it also looks (if you look at the out of focus part at bottom) like the powder is "turning" to the right, it is far from conclusive though. I will get the magnetic film and do the experiment again. It seems that the strongest magnetic force is at the edge, when I moved the...

Perhaps this image is true after all. Considering how the compass reacted to the outer periphery of the disk, as if the magnetic force was concentrated on the edge and following the edge around the disk, also keeping in mind that the compass showed different poles.

Thanks, it was. Thanks, I only had fine iron powder for this test. The compass reacted to the disk quiet strongly, I am sure this was not the Earth's magnetic field. There was also a clear difference to how the compass reacted to the top of the disk versus the bottom..

Thanks, great advice! I only gave short bursts of current. I kept an eye on the temperature of the wires as well.

Hi, thanks for the input. Yes, the conclusion is not definite. If I make an electromagnet it will be a completely different experiment. The point here is to see what the magnetic field will look like/behave if I pass a current through the disk radially from the axis outwards.

Conclusion: I could not see any pattern with the iron powder, my observation method may be too crude. The compass did however give definite readings. It would be interesting to see the magnetic field in 3D. I suspect the magnetic field is swirling and that there are definite poles.

If I flip the disk the compass points to north The compass needle also seems to want to follow the outer periphery of the disk, I noticed this with the other side of the disk, south wanted to follow the periphery of the disk.

The compass points to south where the current entered the disk.

With a closer look it appears that the iron powder has grouped somewhat and is raised.

After I ran the the current through the disk I saw no visible magnetic lines.

Paper on top of disk with fine iron powder.

Steel disk 5cm diameter. (+) axis, (-) brass ring, power 12 volt car battery 70 amps.