diamagnetism

noun

phenomenon exhibited by materials like copper or bismuth that become magnetized in a magnetic field with a polarity opposite to the magnetic force
銅やビスマスのような磁場で磁力への極性正反対で磁化するようになる材料によって示された現象

unlike iron they are slightly repelled by a magnet
鉄とは違って、わずかに磁石に反発する

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