Thaum koj xav txog ib lub hlau nplaum, koj yuav tau tsom ntsoov rau nws lub peev xwm txaus nyiam los nyiam lossis tawm tsam lwm yam khoom. Txawm li cas los xij, koj puas paub tias cov hlau nplaum tseem muaj cov kev taw qhia tshwj xeeb ntawm cov hlau nplaum? Cia peb delve tob rau hauv lub ntiaj teb ntawm cov hlau nplaum thiab tshawb xyuas cov kev taw qhia magnetized thiab magnetization ntawm cov hlau nplaum.
Yuav pib nrog, magnetization yog txheej txheem ntawm kev tsim cov magnetic teb nyob rau hauv cov khoom. Lub magnetic teb yog generated los ntawm kev sib raug zoo ntawm electrons nyob rau hauv cov khoom. Thaum cov electrons txav mus rau tib txoj kev, lawv tsim ib qho chaw sib nqus, uas thaum kawg ua rau cov hlau nplaum. Hauv cov ntsiab lus yooj yim, magnetization yog txheej txheem ntawm kev tsim cov hlau nplaum.
Thaum ib tug hlau nplaum yog magnetized, nws muaj ib qho kev taw qhia ntawm magnetization. Qhov no yog cov kev taw qhia nyob rau hauv uas cov electrons yog aligned, thiab nws txiav txim siab tus cwj pwm sib nqus ntawm cov hlau nplaum. Piv txwv li, yog tias koj muaj ib tugbar hlau nplaum, qhov kev taw qhia magnetization yuav nyob ntawm qhov ntev ntawm qhov bar.
Ntxiv nrog rau qhov kev taw qhia magnetization, ib lub hlau nplaum kuj muaj ob lub hlau nplaum - sab qaum teb thiab sab qab teb. Sab qaum teb ncej yog attracted rau sab qab teb ncej ntawm lwm cov hlau nplaum, thaum lub sab qaum teb ncej repels sab qaum teb ncej ntawm lwm hlau nplaum. Ib yam mus rau tus ncej qab teb. Qhov tshwm sim no hu ua magnetic polarity.
Tam sim no, cia peb nkag mus rau hauv nitty-gritty ntawm yuav ua li cas cov kev taw qhia magnetized cuam tshuam rau tus cwj pwm ntawm cov hlau nplaum. Lub magnetization kev taw qhia ntawm ib tug hlau nplaum txiav txim siab lub zog ntawm nws magnetic teb. Thaum cov kev taw qhia ntawm magnetization yog raws qhov ntev ntawm ib tug bar hlau nplaum, nws ua rau muaj zog magnetic teb. Ntawm qhov tod tes, yog tias qhov kev taw qhia magnetization hla qhov dav ntawm cov hlau nplaum, nws ua rau muaj qhov tsis muaj zog hlau nplaum.
Ntxiv mus, cov kev taw qhia magnetization kuj cuam tshuam cov khoom sib nqus ntawm cov hlau nplaum. Piv txwv li, ib lub hlau nplaum nrog nws cov kev taw qhia magnetization mus ntawm tus ncej qaum teb mus rau sab qab teb ncej yog lub npe hu ua "paj" hlau nplaum. Cov hlau nplaum no khaws lawv cov magnetic teb txawm tias tom qab tshem cov teb uas magnetized lawv.
Nyob rau hauv sib piv, ib tug hlau nplaum nrog nws magnetization kev taw qhia mus ncig lub ncig ntawm lub tog raj kheej yog hu ua "demagnetized" hlau nplaum. Cov hlau nplaum no poob lawv qhov chaw sib nqus sai sai tom qab tshem tawm cov hlau nplaum uas ua rau lawv. Cov cuab yeej no muaj txiaj ntsig zoo rau ntau daim ntawv thov, suav nrog credit card strips thiab computer hard drives.
Zuag qhia tag nrho, cov kev taw qhia magnetized thiab magnetization yog ob qho tseem ceeb ntawm cov hlau nplaum tus cwj pwm uas yuav tsum tsis txhob ignored. Nkag siab txog cov ntsiab lus no tuaj yeem pab koj txiav txim siab paub thaum xaiv cov hlau nplaum rau cov ntawv thov sib txawv. Ntxiv mus, nws tuaj yeem muab kev nkag siab txog yuav ua li cas cov hlau nplaum tuaj yeem siv tau zoo dua thiab ua tau zoo.
Ua kom tiav, magnetization yog cov txheej txheem ntawm kev tsim cov magnetic teb nyob rau hauv ib cov khoom, thiab cov magnetized kev taw qhia yog cov kev taw qhia nyob rau hauv uas electrons yog aligned. Qhov no ncaj qha cuam tshuam rau lub zog thiab cov khoom ntawm cov hlau nplaum hlau nplaum. Sib nqus polarity yog txiav txim los ntawm sab qaum teb thiab sab qab teb ncej ntawm cov hlau nplaum, uas yog nyiam los yog tawm tsam lwm cov hlau nplaum. Los ntawm kev nkag siab cov ntsiab lus no, peb tuaj yeem txaus siab rau qhov nyuaj ntawm cov hlau nplaum thiab lawv qhov tseem ceeb hauv peb lub neej niaj hnub.
Post lub sij hawm: Jun-09-2023