how far can an electromagnetic field reach?
For my project I need to know how far electromagnetic fields can reach. I am guessing its related to power and materials, but perhaps there is some kind of rough formula for calculating potential reach?
By reach, I mean, how far can the magnetic field reach and attract (move) something, like metal fillings.
Also, is there anyway to know how quickly a magnetic field can move something. In other words what speed will metal fillings move at when the electromagnet is switched on?
Joel (the snow athlete)