Thaum cov ntaub ntawv uas yuav tsum tau muab cais hla ntawm ib kem sib nqus nyob rau hauv lub lag luam, cov khoom sib nqus yog attracted los ntawm cov hlau nplaum muaj zog, ua rau nws mus rau hauv kem thiab cais los ntawm cov khoom tsis yog -magnetic. Hloov pauv, cov khoom tsis yog- cov khoom sib nqus ntws tawm ntawm sab ntawm kab hlau nplaum.
