A nuclear electric quadrupole moment describes the effective shape of the ellipsoid of nuclear charge distribution. The quadrupole moment depends upon the size and charge of the nucleus.

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'Nuclear quadrupole resonance in chemistry' -- subject(s): Nuclear quadrupole resonance spectroscopy

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magnetic quadrupole is actually a group of four magnets with one pole of each adjacent magnets attract each other such that they create a Magnetic_fieldwhose magnitude Linear_functionwith the Radiusdistance from its longitudinal Coordinate_axis. This is used in Particle_beamfocusing.