Does anyone know a quick way to tell if a cartridge / stylus is moving iron, or moving magnet?

I was wondering if a compass would deflect from being near a moving magnet stylus?

Anyone have thoughts about the sound of the two? I know Stanton made both, but I'm not sure about other brands.

Is a moving iron cartridge actually closely related to the old variable reluctance (VR) type of cartridges?

Any phono cartridge engineers out there?

Dave O.