leej twg nrhiav tau magnetic quab yuam

Qhov kev tshawb pom ntawm lub zog sib nqus yog los ntawm Greek tus tswv yug yaj hu ua Magnes, uas pom qhov nyiam ntawm cov ntsia hlau hlau ntawm nws cov khau khiab thiab cov pob zeb ntawm Mount Ida. Qhov kev tshawb pom no tau tshwm sim nyob ib puag ncig 600 BC.

Txawm li cas los xij, nws tsis yog txog thaum xyoo pua 19th uas cov kws tshawb fawb pib nkag siab txog cov cai tswj kev sib nqus. Nyob ib ncig ntawm xyoo 1820, Oersted tau tshawb pom qhov tseem ceeb ntawm kev sib txuas ntawm hluav taws xob thiab hlau nplaum, thaum Faraday thiab Henry nws tus kheej nrhiav tau lub hauv paus ntawm electromagnetism ob peb xyoos tom qab.

Magnetic force plays lub luag haujlwm tseem ceeb hauv ntau daim ntawv thov kev lag luam, suav nrog cov motors, generators, thiab cov khoom siv sib nqus. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tau xaiv cov khoom zoo sib nqus kom ntseeg tau tias kev ua haujlwm ntev thiab txhim khu kev qha.