Do Permanent Magnets Have Magnetic Fields?

linux kid · 2006-08-23T21:56:23+00:00

I was surprise to find that even HowStuffWorks.com didn't have an article for 'permanaent magnets'. I was wondering, do permanent magnets always have magnetic fields aroung them? What makes them permanent?

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

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. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...

View full post »

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Similar threads

Hot Threads

I Explain Bernoulli at the molecular level?

B Simple mass/scale puzzle

I How deep does it need to go for a physics theory to be consistent?

I Solving a momentum problem where masses change after the collision

B Torque Calculation - Not a basic application

Recent Insights

Insights Quantum Entanglement is a Kinematic Fact, not a Dynamical Effect

Insights What Exactly is Dirac’s Delta Function? - Insight

Insights Relativator (Circular Slide-Rule): Simulated with Desmos - Insight

Insights Fixing Things Which Can Go Wrong With Complex Numbers

Insights Fermat's Last Theorem

Insights Why Vector Spaces Explain The World: A Historical Perspective