Bolt tshuaj xyuas yog muab faib ua ob hom: phau ntawv thiab tshuab. Kev tshuaj xyuas phau ntawv yog qhov yooj yim tshaj plaws thiab siv dav. Txhawm rau txo qhov kev tawm ntawm cov khoom tsis zoo, cov tuam txhab tsim khoom feem ntau tshawb xyuas cov khoom ntim lossis xa khoom pom zoo kom tshem tawm cov teeb meem (xws li xov puas, cov khoom sib xyaw, xeb, thiab lwm yam).
Lwm txoj kev yog kev tshuaj xyuas lub tshuab tsis siv neeg, feem ntau yog siv cov khoom sib nqus sib nqus. Kev ntsuam xyuas cov khoom sib nqus siv qhov kev sib cuam tshuam ntawm cov xaim hlau nplaum ntawm cov ntsia liaj qhov rooj thiab cov khoom sib nqus. Raws li qhov sib txawv ntawm qhov sib nqus permeability ntawm qhov tsis xws luag (xws li cov kab nrib pleb, cov khoom sib xyaw, thiab cov khoom sib xyaw) thiab cov hlau, cov hlau nplaum ntawm cov khoom siv no yuav raug distorted tom qab magnetization. Qhov no tsim kom muaj qhov sib nqus sib nqus ntawm qhov chaw ua haujlwm, nyiam cov khoom sib nqus kom sib sau ntawm qhov tsis xws luag - tsim cov kab sib nqus. Nyob rau hauv cov teeb pom kev zoo tsim nyog, qhov chaw thiab cov duab ntawm qhov tsis xws luag yuav pom. Los ntawm kev soj ntsuam thiab txhais cov khoom sib nqus no, cov khoom puas tuaj yeem txheeb xyuas thiab tshem tawm.