Forces on Magnetic Dipoles
نویسندگان
چکیده
Deduce expressions for the force on a permanent Ampèrian magnetic dipole with momentmA (due to a loop of electrical current), and for the force on a permanent Gilbertian magnetic dipolemG (due to a pair of opposite magnetic charges), when the dipoles are (instantaneously at rest in an external electromagnetic field. Experiments have been performed to determine whether a neutron [6] has an Ampèrian or a Gilbertian magnetic dipole moment, by studying the interaction of neutrons with magnetized foils. The conclusion is that the neutron has an Ampèrian magnetic moment. To accommodate this case, your analysis should consider that the test moment m is inside a magnetic material. Consider also the case that the external fields include (possibly time-dependent) electric fields, and comment on “hidden momentum” [7] of the system.
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