Permanent vs Temporary Magnets
Magnets yog cov khoom tshwj xeeb hauv peb lub neej txhua hnub. Cov hluav taws xob peb siv yog tsim los ntawm cov hlau nplaum. Kev taw qhia tau ua tiav siv cov hlau nplaum; cov khoom siv xws li hard drives, audio cassettes thiab floppy discs yog raws li cov hlau nplaum. Txoj kev xav ntawm cov hlau nplaum yog qhov tseem ceeb heev nyob rau hauv physics. Nws yog ib qho tseem ceeb kom muaj kev nkag siab zoo hauv lub tswv yim ntawm cov hlau nplaum kom ua tau zoo hauv cov haujlwm xws li electromagnetic field theory thiab tag nrho cov kev cuam tshuam. Hauv tsab xov xwm no, peb yuav tham txog dab tsi hlau nplaum yog, cov hlau nplaum ruaj khov thiab cov hlau nplaum ib ntus yog dab tsi, lawv cov ntawv thov, qhov sib xws ntawm cov hlau nplaum ruaj khov thiab cov hlau nplaum ib ntus, thiab thaum kawg qhov sib txawv ntawm cov hlau nplaum ruaj khov thiab cov hlau nplaum ib ntus.
Permanent Magnet
Yuav kom nkag siab cov hlau nplaum ruaj khov, ib tus yuav tsum xub nkag siab lub tswv yim ntawm cov hlau nplaum thiab cov khoom sib nqus. Sib nqus induction yog txheej txheem ntawm magnetization ntawm cov ntaub ntawv nyob rau hauv ib tug sab nraud magnetic teb. Cov ntaub ntawv tuaj yeem muab faib ua ntau pawg raws li lawv cov khoom sib nqus. Paramagnetic cov ntaub ntawv, Diamagnetic cov ntaub ntawv thiab Ferromagnetic cov ntaub ntawv yog rau npe ob peb. Kuj tseem muaj qee yam tsawg dua xws li cov khoom siv tshuaj tiv thaiv ferromagnetic thiab cov ntaub ntawv ferrimagnetic. Ferromagnetic cov ntaub ntawv tseem yog cov ntaub ntawv paramagnetic nrog thaj tsam ntawm cov hlau nplaum dipoles hauv ib qho kev taw qhia txawm tias ua ntej siv cov hlau nplaum sab nraud. Cov khoom siv hlau nplaum tawv muaj zog hlau nplaum ntau dua li cov khoom sib nqus mos thaum raug rau sab nraud. Cov khoom siv hlau nplaum nyuaj yuav muaj cov hlau nplaum txawm tias tom qab tshem tawm sab nraud. Cov no yog siv los tsim cov hlau nplaum ruaj khov. Thaum siv cov teb sab nraud, cov cheeb tsam sib nqus no yuav ua kom lawv tus kheej ua ke mus rau lub tshav pob kom lawv yuav ua rau thaj chaw muaj zog. Ferromagnetism tshuav nyob rau hauv cov khoom txawm tias tom qab sab nraud teb raug tshem tawm, tab sis paramagnetism thiab diamagnetism ploj mus sai li sai tau thaum lub teb sab nraud raug tshem tawm.
Temporary Magnet
Cov hlau nplaum ib ntus yog cov khoom siv uas coj li hlau nplaum tsuas yog thaum muaj qhov sib nqus sab nraud. Cov ntaub ntawv no tseem hu ua cov khoom sib nqus mos. Cov khoom sib nqus ntawm cov khoom ploj sai li sai tau thaum cov khoom sib nqus sab nraud raug tshem tawm. Cov hlau nplaum no ua raws li cov txheej txheem hloov pauv hloov pauv. Yog hais tias ib tug tam sim no nqa coil raug mob nyob ib ncig ntawm ib tug mos magnetic cov ntaub ntawv, lub magnetic teb yuav ob peb zaug loj dua qub magnetic teb. Cov khoom sib nqus mos yog ib feem ntawm tsev neeg ferromagnetic khoom. Cov ntaub ntawv sib nqus mos qhia cov khoom sib nqus muaj zog hauv qhov chaw sib nqus sab nraud tab sis poob cov hlau nplaum tom qab tshem tawm sab nraud. Qhov no ua rau cov nplooj zoo li hysteresis nkhaus.
Qhov txawv ntawm Permanent Magnet thiab Temporary Magnet yog dab tsi?
• Cov hlau nplaum tas mus li muaj cov khoom sib nqus txawm tias qhov chaw sab nraud yog xoom. Cov hlau nplaum ib ntus muaj cov khoom sib nqus tsuas yog nyob rau ntawm qhov chaw sib nqus sab nraud.
• Cov hlau nplaum tas mus li pom ntawm cov khoom sib nqus tawv, uas poob rau hauv tsev neeg cov khoom ferromagnetic. Cov hlau nplaum ib ntus pom hauv cov khoom sib nqus mos, cov ntaub ntawv paramagnetic thiab cov ntaub ntawv diamagnetic.
• Cov hlau nplaum tas mus li yog siv rau hauv cov khoom siv xws li lub tshuab hluav taws xob thiab cov tshuab hluav taws xob. Cov hlau nplaum ib ntus yog siv rau hauv qhov chaw xws li cranes.
