Images related to the furutech controversy Reply #25 – 2009-05-22 21:06:21 Quote from: Arnold B. Krueger on 2009-05-08 12:52:44Static and electromagnetic fields don't interact directly. Technically, they are orthogonal to each other. They co-exist without interacting. Think about it - strong magnets don't collect or dissipate static electricity with their magnetic fields, and static fields don't increase or decrease the strength of magnets.Sorry to butt into this older portion of the thread - Arny, I understand what you're saying but the terminology confused me momentarily. I think you're saying that static electric and magnetic fields don't interact directly, and that's true. When you say "electromagnetic", by definition you're talking about dynamic electric and magnetic fields which are orthogonal. What this means is that there is both a changing electric field AND a changing magnetic field present at the same place and time. And yes, a static field of either kind will have no effect on a static field of the opposite kind.Quote from: pdq on 2009-05-08 15:07:23A magnetic field, no matter how fast it is changing, will have zero effect on a stationary static charge. Only a charge which is moving is affected by magnetic fields, and even then the effect is still weak.Technically, you cannot have a dynamic magnetic field or electric field except in isolation. The moment you introduce a dielectric (such as "free space" or a conductor, a changing electric or magnetic field will induce the other, and you will see an electromagnetic field. Maxwell's 3rd and 4th laws. This is how radio works; a changing electric charge distribution in an antenna (conductor) causes electromagnetic waves to be generated at the aperture (free space). So in a real-world situation a changing magnetic field will generate a dynamic electric field, which in turn will affect that static charge - by causing it to oscillate. The reason a moving charge is affected by a magnetic field is that the charge's motion causes a magnetic field to be generated (right-hand rule) which will interact with other magnetic fields. This is how detectors work in particle accelerators, for example.Sorry for the pedantry; it's not that I disagree with the positions being stated, it's just that my EE training pipes up from my hindbrain occasionally and demands to be let out. The relevancy is that any static charge on an LP will indeed generate a magnetic field as the LP spins, although at a low frequency as noted elsewhere in the thread. As Axon states, its effect on the cartridge is likely to be very very small.End of sidetrack; please carry on, this is interesting.