B ext . This net magnetic dipole moment can partially persist when B ext is removed. If B ext is nonuniform, the ferromagnetic material is attracted to regions of greater magnetic field. These properties are called ferromagnetism . Exchange coupling disappears when a sample's temperature exceeds its Curie temperature , and then the sample has only paramagnetism.
Gaussian surface is zero.
You are guest number since Sept. 15, 1999. Div. of Sci. Search Send comments and questions to Irina Nelson, Ph.D. , Physics Professor. Johnny Erickson currently creates and maintains this site. Learn more about the past designers.