Kufotokozera kwa Lamulo la Faraday la Magnetism
Michael Faraday anali m'modzi mwa asayansi otchuka kwambiri m'mbiri ya sayansi. Kudzera mu zoyeserera zosiyanasiyana zolenga komanso changu chosatha, adapeza mfundo zomwe zinakhala maziko a maginito amakono. Chimodzi mwa zopereka zake zazikulu chinali Lamulo la Faraday la Kuyambitsa Magetsi, lomwe linafotokozedwa koyamba mu 1831. Lamuloli limafotokoza momwe mphamvu ya maginito yosinthika ingapangire mphamvu yamagetsi mu kondakitala, mfundo yomwe ndi maziko a ukadaulo wambiri wamagetsi womwe timagwiritsa ntchito masiku ano.
Mfundo Zoyambira za Chilamulo cha Faraday
Lamulo la Faraday limati "mphamvu yamagetsi (emf) yomwe imachitika mu closed circuit imagwirizana ndi kusintha kwa maginito kudzera mu circuit." Mu masamu, lamulo la Faraday lingalembedwe motere:
\[ \masamu{E} = -\frac{d\Phi_B}{dt} \]
Apa, \( \mathcal{E} \) (epsilon) ndi mphamvu yamagetsi yoyendetsedwa (emf), ndipo \( \Phi_B \) (phi-B) ndi mphamvu yamagetsi. Chizindikiro choyipa mu equation iyi ndi zotsatira za Lamulo la Lenz, lomwe limati emf yoyendetsedwa nthawi zonse imachita zinthu m'njira yotsutsana ndi kusintha kwa mphamvu yamagetsi.
Kutuluka kwa maginito (\( \Phi_B \)) kumatanthauzidwa motere:
\[ \Phi_B = B \cdot A \cdot \cos(\theta) \]
kumene \( B \) ndi mphamvu ya maginito, \( A \) ndi malo omwe mphamvu ya maginito imadutsa, ndipo \( \theta \) ndi ngodya pakati pa mphamvu ya maginito ndi mzere wolunjika pamwamba pake.
Chochitika Choyambitsa Magetsi cha Magetsi
Kuti timvetse momwe Faraday's Law imagwirira ntchito, titha kuganiza za zochitika zakale zoyesera. Chitsanzo chimodzi chikuphatikizapo kugwiritsa ntchito solenoid, kapena coil ya waya. Tikalumikiza dera lamagetsi ku solenoid, mphamvu yamagetsi yomwe ikuyenda kudzera mu waya imapanga mphamvu ya maginito.
Tsopano, taganizirani kuti tili ndi maginito omwe tingathe kulowa ndi kutuluka mu solenoid. Pamene maginito akuyenda, mphamvu ya maginito yomwe ili mkati mwa solenoid imasinthanso. Izi zimapangitsa kusintha kwa mphamvu ya maginito kudutsa mu coil ya waya, zomwe zimapangitsa kuti magetsi ayambe kugwira ntchito mu coil. Ichi ndi chitsanzo chosavuta cha momwe Faraday's Law imagwirira ntchito.
Kugwiritsa Ntchito Lamulo la Faraday M'moyo Watsiku ndi Tsiku
thiransifoma
Chimodzi mwa ntchito zomwe zimafala kwambiri mu lamulo la Faraday ndi transformer yamagetsi. Transformer ndi chipangizo chomwe chimasintha kuchuluka kwa magetsi a dera lina kupita ku lina kudzera mu induction yamagetsi. Transformer imakhala ndi ma coil awiri a waya (oyamba ndi achiwiri) ozungulira pakati pa chitsulo chofanana. Pamene mphamvu yosinthira ikuyenda kudzera mu coil yoyamba, mphamvu ya maginito yopangidwa ndi mphamvu iyi imayendanso kudzera mu coil yachiwiri. Mphamvu ya maginito yosinthayi imayambitsa magetsi mu coil yachiwiri. Pogwiritsa ntchito mfundo iyi, titha kuwonjezera kapena kuchepetsa magetsi ngati pakufunika.
Jenereta yamagetsi
Majenereta amagetsi amagwiritsidwanso ntchito mwachindunji ndi lamulo la Faraday. Mu jenereta, mphamvu yamakina imasinthidwa kukhala mphamvu yamagetsi. Pamene ma waya kapena maginito amayenda moyandikana, kusintha kwa maginito kudutsa ma coil kumapanga mphamvu yamagetsi. Majenereta amagetsi ndi gawo lofunikira kwambiri m'mafakitale amagetsi, kaya magetsi amadzi, kutentha, nyukiliya, kapena magetsi ena.
Kulowetsa pa Zophikira Zopangira ...
Ma cooktop ophikira pogwiritsa ntchito induction amagwiritsanso ntchito mfundo za Faraday's Law. Mu induction cooktop, magetsi osinthasintha amayenderera kudzera mu waya womwe uli pansi pa cooktop. Magetsi awa amapanga mphamvu ya maginito yosintha. Pamene ferromagnetic poto ikayikidwa pa cooktop, mphamvu ya maginito yosintha imayambitsa magetsi (omwe amadziwika kuti eddy currents) pansi pa poto, zomwe zimapangitsa kutentha chifukwa cha kukana kwa magetsi kwa zinthu za poto.
Lamulo la Lenz ndi Kusunga Mphamvu
Tanena kale kuti chizindikiro choyipa mu equation ya Faraday chimachokera ku Lamulo la Lenz. Lamulo la Lenz limati mphamvu yamagetsi yomwe imachitika chifukwa cha kusintha kwa mphamvu yamagetsi nthawi zonse imapanga mphamvu yamagetsi yomwe imatsutsana ndi kusintha komwe kunayambitsa. Ichi ndi chiwonetsero cha mfundo yosungira mphamvu.
Ngati sitiganizira za Lamulo la Lenz, tikhoza kukhala ndi mphamvu yopangidwa kuchokera ku chinthu chilichonse, kuphwanya lamulo loteteza mphamvu. Mwa kuonetsetsa kuti kusintha kwa maginito komwe kumapanga magetsi nthawi zonse kumagwira ntchito motsutsana ndi kusintha komwe kunayambitsa, Lamulo la Lenz limasunga mphamvu moyenera m'dongosolo.
Mwachitsanzo, tikakankhira maginito mu solenoid, timafunika kuchita khama lamakina kuti tigonjetse mphamvu ya maginito yomwe imapangidwa ndi mphamvu yamagetsi yomwe imapangidwa mu coil. Khama limeneli silimangotayika; limasanduka mphamvu yamagetsi mkati mwa dongosolo. Mosiyana ndi zimenezi, tikatulutsa maginito mu solenoid, timafunikanso khama lamakina kuti tikoke maginito motsutsana ndi mphamvu ya maginito yomwe imapangidwa.
Mayeso Ofunika Kwambiri a Faraday
Mayesero ambiri a Faraday anali ofunikira kwambiri posonyeza malamulo amenewa. Chimodzi mwa mayesero amenewa chinali diski ya Faraday, yomwe inali ndi diski yachitsulo yozungulira pakati pa mitengo ya maginito amphamvu. Mu kuyesera kumeneku, Faraday adawonetsa bwino kuti kuyenda pakati pa maginito ndi kondakitala kumayambitsa magetsi, zomwe zimapangitsa kuti ikhale imodzi mwa mayesero ofunikira kwambiri pa maginito amagetsi.
Mphamvu ndi Zotsatira zake
Kupeza kwa Faraday za kulowetsedwa kwa maginito sikunangoyambitsa chitukuko cha ukadaulo wamagetsi, komanso kunatsegula njira yoti timvetsetse bwino momwe magetsi amagwirira ntchito ndi maginito. Kafukufuku wa Faraday adakhudza James Clerk Maxwell, yemwe pambuyo pake adapanga ma equation a Maxwell, kuphatikiza magetsi, maginito, ndi kuwala kukhala ma equation oyambira, omwe amadziwika kuti chiphunzitso cha maginito.
Chiphunzitsochi chinalinso ndi zotsatira zazikulu pakukula kwa ukadaulo wolumikizirana, kuphatikizapo kupangidwa kwa wailesi ndi Guglielmo Marconi, ndipo pamapeto pake chinathandiza kuti pakhale ukadaulo wamakono wopanda zingwe monga mafoni a m'manja, Wi-Fi, ndi GPS.
Mapeto
Lamulo la Faraday la Kuyambitsa Magetsi ndi limodzi mwa maziko ofunikira kwambiri a sayansi ya fizikisi ndi uinjiniya wamagetsi. Kuyambira kuyenda kosavuta kwa maginito ndi ma coil a waya, mpaka kugwiritsa ntchito kovuta mu majenereta amagetsi ndi ma transformer, mfundo iyi yomwe Michael Faraday adapeza m'zaka za zana la 19 ikupitilirabe kukhala ndi mphamvu yayikulu pa miyoyo yathu yatsiku ndi tsiku. Kumvetsetsa lamuloli sikuti kungotithandiza kumvetsetsa kuchuluka kwa zida zamakono zamakono zomwe zimagwira ntchito, komanso kumatipangitsa kumvetsetsa bwino mfundo zazikulu za chilengedwe chonse.
