What is the practical effective field distance?
Typically with all round electromagnets, one unit of distance requires about four units in diameter of the said electromagnet. As an example our 4 inch magnet has a usable field about 1 inch from the electromagnet where our 2 inch dia. electromagnet has about .5″ and our 1.0 inch dia. electromagnet has a field up to about .25″. At that point the field is usable, but may be fairly weak when using the units at their rated voltage.
