The electric chargea€“magnetic dipole interaction is considered. If $Gamma_{ m em}$ is the electromagnetic and $Gamma_{ m mech}$ the mechanical angular momentum, the conservation law for the total angular momentum $Gamma_{ m tot}$ holds: $Gamma_{ m tot}$ =$Gamma_{ m em}$ + $Gamma_{ m mech}$ = ${ m const.}$, but when the dipole moment varies with time, $Gamma_{ m mech}$ is not conserved. We show that the non-conserved $Gamma_{ m mech}$ of such a macroscopic isolated system might be experimentally observable. With advanced technology, the strength of the interaction hints to the possibility of novel applications for gyroscopes, such as the electromagnetic top.
展开▼
