作者:毕延芳,严陆光
关键词:门人:8496,日月:5273
单位:Graduate School,University of Science and Technology of

China, Beijing





,Institute of Electrical Engineering,

Academia Sinica, Beijing
摘要:<正> The force-free magnets are those in which the current

density J is everywhere parallel to the field H, i.e. J=αH,

where a is a scale function called force-free factor or

function.Therefore the Lorentz force f is equal to zero, since f=

μJ×H=0.However, from the virial theorem of mechanics it can be

verified that