It's not my drawing so it's only approximately what I was talking about. The flux return path should cover the entire outer magnet faces. I don't see that the vertical section being on only one side of the disc would matter because the flux is entirely inside the vertical section. Also the flux...
What is needed is a setup with no external flux to influence the measurement wires, as per the picture. Preferably the pole piece would cover the entire top surface of the upper magnet and bottom surface of the lower magnet. Then hold the disc and wires stationary and rotate the magnets and pole...
Delta², does SR affect other kinds of electrical machines too? If not, why is this Faraday disc experiment so unique? Why should it be so simple yet so complex for no obvious reason? Can any practical use be made of these rotating frames of reference for everyday machines? Is there an Complete...
After looking at your drawing for a bit, I think that if the field DOES rotate with the magnet then the length BC would have a voltage induced in it, but if the field does NOT rotate with the magnet then the length BD would have a voltage induced instead. No wonder people have been discussing...
Hydrogen is sometimes used as a coolant inside really big electrical generators in power stations. It is very thin and whispy compared to air and this is a big concern for a generator running at 3600rpm when the rotating part is 2 metres diameter...
Another experiment I did was to get a stack of old magnets from microwave ovens and halfway up the stack put a copper disc. Then I put one wire down the centre hole to the centre of the copper disc and a second wire through a hole in the side to the edge of the disc. Essentially all the flux...
One of the test setups I made way back used the magnet and pole piece assembly from an ordinary loudspeaker. I cut a strip of copper and formed it into a loop and soldered the ends together. I put a length of tape on the inside and the outside of the loop but left the edges bare. Then I placed...
You don't need a change in the field. Think of a dynamic microphone. As the voice coil moves through the gap the air gap flux density (in a good microphone at least!) remains constant but the voice coil does produce a voltage.
I remember finding this interesting when I found it not long after it was published. The author copped a lot of flak from the scientific community at the time IIRC. ->...
Wow!
Back in the late 90's I battled with titans on the old sci.physics.electromagnetics usenet group, having come to this exact conclusion through my own experiments but I was shouted down by all and sundry, some who had Phd's in subjects I didn't know existed and others who were just plain...
Suppose for a moment you had a circular copper disc placed concentrically in the air gap between the poles of an upper and a lower circular magnet, the outer faces of the upper lower magnet being connected by a pole piece so as to complete the magnetic circuit. The edge of the copper disc is...