Some Properlies of Laboratory Electrornagnet

We have made a Weiss type electromagnet for use of laboratory experiment and tested its field strength and uniformity about several gap distances and about various forms of pole pieces. For practical use，we get the field strength of 11,000，Oe in the 1.7cm air gap and 5,000 Oe in the 4cm gap，both at 12 A of exciting current