3 ms·
> However, when an electret is moved with respect to a magnetic pole, a force is felt which acts perpendicular to the magnetic field, pushing the electret along
by klyrs 4y ago
> However, when an electret is moved with respect to a magnetic pole, a force is felt which acts perpendicular to the magnetic field, pushing the electret along a path 90 degrees to the expected direction of "push" as would be felt with another magnet.
The heck?? Why was I not exposed to this as a kid? (After searching awhile) Why does nobody make these for sale?
- CamperBob2 4y agoThe perpendicular force might not be strong enough to notice in most cases, would be my guess. I've never heard of it either.
- richk449 4y agoYou probably have heard it before, you just need to connect it to the physics terminology. The Lorentz force law says that a charged particle moving in a magnetic field experienced a force given by the cross product of the velocity and the magnetic field: https://en.wikipedia.org/wiki/Lorentz_force https://en.wikipedia.org/wiki/Lorentz_force
- klyrs 4y agoI'm well familiar with the Lorentz force! Did homework finding paths charged particles take through fields and everything. What's novel to me (if obvious in retrospect) is that a nontrivial electric charge/potential can be frozen within a chunk of dielectric. This is as fundamental as magnetism, and I'm somewhat buffaloed by the fact that electrets aren't more commonplace novelty items.