Definition of "quadrupole" []

• A distribution of either electric charge or magnetization equivalent to two dipoles that point in opposite directions (noun)
• A magnet with two north poles and two south poles, used to focus a beam of particles (noun)

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• "Posted December 1, 2006 7: 14 PM quadrupole writes:"
• "Posted December 1, 2006 6: 20 PM quadrupole writes:"
• "Posted December 1, 2006 3: 03 PM quadrupole writes:"