# Electric charge is a magnetic dipole when placed in a background magnetic field

title={Electric charge is a magnetic dipole when placed in a background magnetic field},
journal={Physical Review D},
year={2014},
volume={89},
pages={047504}
}
• Published 16 February 2014
• Physics
• Physical Review D
It is demonstrated, owing to the nonlinearity of QED, that a static charge placed in a strong magnetic field\ $B$\ is a magnetic dipole (besides remaining an electric monopole, as well). Its magnetic moment grows linearly with $B$ as long as the latter remains smaller than the characteristic value of $1.2\cdot 10^{13}\unit{G}$ but tends to a constant as $B$ exceeds that value. The force acting on a densely charged object by the dipole magnetic field of a neutron star is estimated.
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