First of all I need to let you know that I'm not an Engineering student. I'm just dabbling with it in a hobbie capacity.
I recently wrapped 11 layers of 30gauge magnetic wire around a ball, approximatly 2" in diameter. Leaving a lead and starting from the top(north) continously winding it untill I reached the bottom(south) and then back to the top again. I continued this pattern untill the eleven layers were completed ending up at the bottom. This was all done in a consistant clockwise direction. I then applied a 10volt dc current and found that the compass needle moved to the left(west) when the compass was in the upper half of the ball. The needle moved to the right(east) when the compass was in the lower half of the ball. The upper half followed the right rule but the lower half doesn't. After testing it several times for consistancy, I ended up gluing the entire essembly together and removing the interior rubber ball that I used to form the windings. I did this because, I felt that the rubber was in some way, perhaps through static, influencing the compass readings. I was pleased to see that it didn't make a difference but I'm still confused that this doesn't follow the right hand rule for the bottom half of the sphere. What really intrigued me was when I flipped the essembly over and viewed it from the bottom(south) following the wire around, the wire actually winds around in a counter clock-wise direction. So is the compasses deflection correct, accoding to the right hand rule. The field direction changes when it passes the equatoral region(half way point)??? So, just to see if I was doing this correctly, I wound the same amount of wire around a cylindercal pvc pipe, glued the windings together as before, removed the pvc pipe, applied 10volts dc, moved the compass to the top half and the bottom half and found that if follows the right hand rule, there was no deflection that doesn't follow the right hand rule. I don't get it.
Does anyone have an explanation or links were I can read up on this? This can't be new. I'm not able to find any web referances, perhaps I'm not searching with the correct terminology. Can you tell me what terms to search with or explain what is going on?
Thanks
I am not exactly certain of your orientation readings, but it sounds to me that the magnetic deflection is exactly what is expected: Deviation in the upper hemisphere is opposite that in the lower hemisphere.
A note: it matters not how you wound the coil, clockwise, or counterclockwise: what matters is the direction of current. The right hand rules involved here are straightforward.
Thanks
It may be me or it's the way I'm explaining things. The way I see my readings is that there's definetly a conflict. My orientation readings are made by having my wire sphere sationary and moving only the instument that interperates the flux field direction of influence, namely the compass. As the compass is moved from the upper hemisphere to the lower half, the coppass needle is deflected, from an Eastern orientation, to a Western orientation. I found this ratther courious, since I tested it duplicating the process on a cylindrical shaped and there is no deflection by the needle when the compass is moved from the upper end of the cylinder to the lower end of the cylinder. My question is now. How does shape (disk/soleniod/toriod/cylindercal/sphere) influence magnetic flux field orientation.
The winding you have will produce a N pole on one end, and a S pole on the other. Naturally, a magnet will be deflected in opposite directions on the top and the bottom.
The winding you have will produce a N pole on one end, and a S pole on the other. Naturally, a magnet will be deflected in opposite directions on the top and the bottom.
To understand the magnetic field orientation in different shapes, you can start by familiarizing yourself with the concept of magnetic dipole. A magnetic dipole refers to the pairing of a north and south pole, similar to a bar magnet. In your case, your wound wire sphere acts as a magnetic dipole.
When you have a magnetic dipole, the magnetic field lines follow a specific pattern. They run from the north pole to the south pole outside the dipole and from the south pole to the north pole inside the dipole. This means that the magnetic field lines curve towards the center inside the dipole and curve away from the center outside the dipole.
Now, let's consider the different shapes you mentioned:
1. Sphere:
In a spherical shape, the magnetic field lines will follow the same pattern as described above. So, when you move the compass from the upper half of the sphere to the lower half, the compass needle moves in the opposite direction, as expected.
2. Cylinder:
In a cylindrical shape, the magnetic field lines also follow the same pattern as described above. However, since the cylinder has a consistent diameter throughout, there is no change in the magnetic field as you move from the upper end to the lower end. As a result, the compass needle does not deflect in this case.
The important thing to note here is that the deflection of the compass needle depends on the change in the magnetic field as you move from one point to another. If there is a change in the magnetic field, the compass needle will deflect.
To further understand this topic, you can search for terms like "magnetic field lines in different shapes" or "magnetic dipole in various configurations." Additionally, studying magnetic field theory and electromagnetism will provide you with a deeper understanding of these concepts.
Remember, experimentation and observation are valuable tools in understanding physics concepts, so keep exploring and testing to gain more insights.