Recent content by FusionJim

@hutchphd Pardon, but I don't understand how can the forces be "not well defined"? Because if I would construct this loop in real life with sliding contacts and then pull the side bars outwards with different speeds, there would be real measurable torque that I would need to apply to each in...

Hey folks, It seems I have a problem understanding a thought experiment I myself thought of. Not saying I was the first to think of it, but it puzzles me nevertheless. Assume there is a conducting rectangular loop, the red loop side legs have a frictionless and perfect electrical contact...

@solvejskovlund I think I have a good guess as to what happened to your 3 bulbs. I think you had stressed them with your experiment slightly over their rated voltage and therefore also current, there are graphs on the internet but I believe that IIRC filament lifetime decreased exponentially...

Hello, I want to know whether there exists a solid material that would have a conductivity similar to say copper or aluminum but where the "free electrons" aka conduction electrons would be free to move in one dimension. Imagine a rectangular sheet of such material, suppose we have an...

No , the magnet is not a toroid like that, it s a permanent ring magnet but cut in half, so closer to this.

Just imagine the usual toroidal ring magnet but cut in half. this half ring is rigidly attached to the disc and rotates with it. Assume the flux doesn't return back through the disc plane but instead loops around and comes back through the stationary loop part. The red half in the drawing...

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not...

@ Guineafowl I found a replacement controller, and a different motor that has roughly the same size. now it works it seems. This motor that I had previously, I believe the windings either in stator or rotor armature had shorted because even with the new added controller it still heated up fast...

Long story short, I got a vacuum cleaner with a standard universal series motor inside. It also had the TRIAC pcb with a potentiometer and a triac/thyristor to control the RPM which allowed to control the suction power. Some moisture got on the pcb and it shorted. I simply took it out since I...

@renormalize The split I was talking about exists in the area of the core where the coils are located. In that area the core is not one solid core but instead has two parallel legs with a gap between them. As can be seen in the "above view". @berkeman Yes I believe I am aware of those terms...

Suppose there is a rectangular core. At one part of the core it is split in two identical parallel sections , each section has a coil around it. Both coils are identical and current runs in the same direction through both. The magnetic flux within the core is created by the coils. My question is...

I suppose one thing is certain. The E field that will result from a magnet being moved/rotated in any other way than around it's field symmetry axis is a non conservative E field? Meaning that the field lines do not end on surfaces perpendicularly to them like they would from an electrostatic...

@TSny thank you for the reply. I realized long ago that magnetic field lines are just a man made concept, so we only truly have field strength and geometry as the only physical quantities. If this is the case then it seems weird that a non axis symmetric magnet co-rotates with the disk and no...

The Faraday disc generates current if spinning in a homogeneous magnetic field, it also generates current if there is a non symmetric magnetic field but then the magnet producing that field has to be kept stationary with respect to the disc. In fact back in Faraday's time he had first a field...

Hmm , I've seen industry companies selling large DC motors advertizing them publicly as for use in submarines like the Siemens permasyn type, but i thought their mistly for diesel subs, so your saying nuclear subs drive the prop directly from turbine vua a reduction gearset? Ni electric motor on...