Recent content by doomer

Yes, just one more thing... I don't understand why there is no EMF in this case? : The upper section of the wire loop is so wide and high that field lines can't reach it (or at least the induced voltage in this section is very tiny), left side of wire loop (section near the axis) is cut and...

That's correct, but equal and opposite canceling voltages appear in wire(?), the magnetic field curl, double cut at two different points, take a look: Two scenarios: spinning wire (brushless faraday disc) EMF=0 and passing wire EMF=1 This is the reason why spinning Faraday disc needs brushes.

Ok thanks, right, the field become weaker with distance and so the "opposing voltage" thus emf is not canceled, the axis line is not needed for emf. However: I have some tiny current in spinning wire scenario BUT not as much as in passing wire scenario, I blame it on wobble and vibrations when...

Can you simplify things for me? Why when I rotate wire over the magnet pole there is no EMF induced but when I just pass the wire over the magnet then there is EMF?

What do you mean? every line that is coming out from pole must be cut in two points; at the middle and at sides, this should lead to cancelation, you are saying that some lines do not form loops when they are far away from magnet?? I can make a loop that is 100 meter long, there is no way that...

Ok so there is a line that goes to infinity, got it. This axis line create unbalance so induction can happened when I cut the line loops? take a look: The blue lines represent induced voltage vectors in orange (copper) wire that cuts the lines over the pole. The wire form a loop and the rest of...

Thats interesting, one center line that does not form a loop but how? this is a magnetic vector potential or something else? I always fought that lines are just a mathematical model, not a physical thing... Sun particles are trapped inside the earth's magnetic field "cone area" and this causes...

I don't get this... there is is no field at the center? a deadzone? single center line can't exist there, right? or its a field cone that starts at single point in the middle near the surface?

So there is a line and field in the middle? and the other lines are branching out from that center line and make loops too? I wish I could see field in a 3d and without lines, just a 3d gradient model of the field and its shape...

This? there is a magnetic line in the middle that goes somewhere? or its something else?

Magnetic field lines are loops, so at the surface of a magnet (axially magnetized) cylinder) pole they look like this? there is a dead zone at the center where there is no lines/magnetic field present? or perhaps they look more like this? lines converge in the middle to a single line or point...

What a nonsense, it seems that you knowledge about homopolar generators is worse than mine. Check the link, this is valid brushed homopolar generator with one magnet under disc and it works, perfect parallel vertical magnetic field is not needed 🤣 Did you see arrow at the top? it shows...

By contact you mean brushes in faraday disc? If I place magnet on a wire and short this wire via switch, would I get some emf?

No, you didn't explain it in simple terms or even not at all, because that would require drawing opposing forces vectors and you didn't do that. "it's canceling because disk moves " - this is not enough. Placing a small magnet under the disc so the field won't cross the wires is making things...

Yes, but I want to know why brushes are necessary, if the center wire is causing trouble then why not use a ring magnet on top of copper disc and insert a mu metal pipe aka magnetic shielding in the center of such magnet to shield the center wire from magnetic field and rotate everything with...