Nheyo dzeElectromagnetism
Magnetism ndeimwe yemasimba mana makuru ezvisikwa, mamwe matatu ari simba rinokwevera pasi, simba renyukireya rakasimba, uye simba renyukireya risina simba. Simba iri rinotonga kudyidzana pakati pezvikamu zvinotsvairwa uye rinoumba hwaro hwekunzwisisa zvinhu zvakasiyana-siyana zvepanyama, kubva pakushanda kwezvishandiso zvemagetsi zvezuva nezuva kusvika pamaitiro ezvisikwa zvemuchadenga. Chinyorwa chino chinotarisa zvakadzama zve electromagnetism, chichitaura pfungwa huru, misimboti, uye mashandisirwo.
Historical Background
Kudzidza nezve electromagnetism kunogona kuteverwa kumashure kusvika muzana remakore rechi18 nerechi19. Vavambi vakaita saCharles-Augustin de Coulomb, André-Marie Ampère, naMichael Faraday vakaita bvunzo dzakaisa hwaro hwekunzwisisa kwedu pari zvino. Zvisinei, ndiJames Clerk Maxwell akabatanidza pfungwa idzi muma1860 ne seti yake yema equation, inozivikanwa nhasi se ma equation aMaxwell. Ma equation aya anoumba musimboti we classical electromagnetism uye anotsanangura kuti magetsi nema magnetic fields zvinopararira uye zvinobatana sei.
Magetsi Chaji uye Minda
Pakati pesimba remagetsi pane simba remagetsi, iro rinonyanya kukosha muzvikamu. Kune mhando mbiri dzesimba remagetsi: rakanaka nerakaipa. Simba remagetsi rinokwezvana, nepo simba remagetsi richidzingana. Chikamu chesimba remagetsi ndicho coulomb (C).
Munda wemagetsi inzvimbo yemagetsi inotenderedza machaji emagetsi. Kutungamira kwemunda ndiko kwainoenda simba iro charge yekuedza yakanaka yaizosangana naro. Simba remunda wemagetsi \( \vec{E} \) rinoyerwa mumavolts pamita (V/m) uye rinoverengerwa uchishandisa mutemo waCoulomb:
\[ \vec{E} = \frac{k_e Q}{r^2} \hat{r} \]
kupi:
– \( k_e \) ishoko rekuti Coulomb risingaperi (\( 8.99 \times 10^9 \, \text{Nm}^2/\text{C}^2 \)),
– \( Q \) ndiyo muripo,
– \( r \) ndiko kureba kubva pakuchaja,
– \( \hat{r} \) ndiyo vhekitari yeyuniti iri munzira kubva pakuchaja kusvika panzvimbo yekufarira.
Minda yeMagineti neMasimba
Minda yemagineti inogadzirwa nekuchaja kwemagetsi kunofamba, senge maerekitironi anoyerera nepawaya. Simba remagineti \( \vec{B} \) rinoshandisa simba pane mamwe machaja ekufamba uye minda yemagineti. Chikamu chesimba resimba remagineti ndicho tesla (T).
Hukama huripo pakati pemagetsi, simba remagineti, nesimba rinoshandiswa pakuchaja kunofamba hunotsanangurwa nemutemo weLorentz force:
\[ \vec{F} = q(\vec{v} \nguva \vec{B}) \]
kupi:
– \( \vec{F} \) isimba,
– \( q \) ndiyo mhosva,
– \( \vec{v} \) ndiko kumhanya kwekuchaja,
– \( \nguva \) inomiririra chigadzirwa chakasanganiswa,
– \( \vec{B} \) ndiyo simba remagineti.
Imwe nheyo huru ndeyeMutemo waAmpère, uyo unobatanidza simba remagineti rakatenderedza denderedzwa rakavharwa nemagetsi anopfuura nepadenderedzwa:
\[ \oint \vec{B} \cdot d\vec{l} = \mu_0 I_{\text{enc}} \]
kupi:
– \( \mu_0 \) ndiyo kupenya kwenzvimbo yakasununguka (\( 4\pi \times 10^{-7} \, \text{Tm/A} \)),
– \( I_{\text{enc}} \) ndiyo current yakavharirwa.
Electromagnetic Induction
Chimwe chezvinhu zvakakosha zvakawanikwa mu electromagnetism i electromagnetic induction, iyo Michael Faraday akawana muna 1831. Mutemo waFaraday unoti simba remagineti rinoshanduka mukati me closed loop rinokonzeresa simba remagineti (EMF) muwaya. Iyi nheyo ndiyo hwaro hwekushanda kwemajenareta nema transformer. Pamasvomhu, Mutemo waFaraday unotsanangurwa se:
\[ \masvomhu{E} = -\frac{d\Phi_B}{dt} \]
kupi:
– \( \mathcal{E} \) ndiyo EMF inokonzerwa,
– \( \Phi_B \) ndiyo magnetic flux.
Chiratidzo chekusaratidza chinoratidza divi reEMF rinokonzerwa richipikisa shanduko yemagnetic flux, pfungwa inozivikanwa seLenz's Law.
Maequations aMaxwell
Maxwell akabatanidza mitemo yemagetsi nemagnetism kuita dzidziso yakabatana nemaequation ake mana:
1. Mutemo waGauss weMagetsi:
\[ \nabla \cdot \vec{E} = \frac{\rho}{\epsilon_0} \]
Mutemo uyu unoti kuyerera kwemagetsi kuburikidza nepanzvimbo yakavharwa kunoenderana nechaji yemagetsi yakavharirwa \( \rho \).
2. Mutemo waGauss weMagineti:
\[ \nabla \cdot \vec{B} = 0 \]
Mutemo uyu unoratidza kuti hapana mamonopole emagineti; flux yemagineti inopinda nepanzvimbo yakavharwa ndeye zero.
3. Mutemo waFaraday weKutanga:
\[ \nabla \nguva \vec{E} = -\frac{\ partial \vec{B}}{dt} \]
4. Mutemo waAmpère (nekugadziriswa kwaMaxwell):
\[ \nabla \nguva \vec{B} = \mu_0 \vec{J} + \mu_0 \epsilon_0 \frac{\partial \vec{E}}{dt} \]
Mutemo uyu unobatanidza simba remagineti nemagetsi \( \vec{J} \) uye minda yemagetsi inochinja.
Maequation aya anotsanangura kuti magetsi nemagineti zvinogadzirwa sei uye zvinochinjwa sei pakati pazvo uye nechaji nemafurenzi. Anofanotaurawo kuti kune mafungu emagetsi, anofamba nekumhanya kwechiedza.
Magetsi Mafungu
Mafungu emagetsi imhinduro dzeequations dzaMaxwell dzinotsanangura mafungu anopararira emagetsi nemagetsi. Mafungu aya anofamba nemuchadenga nekumhanya kwechiedza \( c \):
\[ c = \frac{1}{\sqrt{\mu_0 \epsilon_0}} \anenge 3 \kawa 10^8 \, \text{m/s} \]
Mafungu emagetsi anosanganisira mafungu eredhiyo, ma microwave, infrared, chiedza chinooneka, ultraviolet, ma X-ray, uye gamma rays. Kureba kwemafungu uye frequency yemafungu aya zvinosarudza nzvimbo yawo mu electromagnetic spectrum.
Mashandisirwo eElectromagnetism
Magnetism inowanikwa zvakanyanya mu tekinoroji yemazuva ano uye kutsvagurudza kwesainzi. Mamwe emashandisirwo ayo makuru anosanganisira:
1. Kugadzira uye Kugovera Simba reMagetsi: Majenareta anoshandura simba remakanika kuita simba remagetsi achishandisa electromagnetic induction. Matransformer anogadzirisa mazinga emagetsi ekutumira uye kugovera.
2. Masisitimu Ekutaurirana: Redhiyo, terevhizheni, uye network dzenharembozha dzinoshandisa mafungu emagetsi kufambisa ruzivo.
3. Matekinoroji Ekurapa: MRI (Magnetic Resonance Imaging) scanners inoshandisa simba remagineti nemasaisai eredhiyo kugadzira mifananidzo yakadzama yemuviri wemunhu.
4. Kufambisa Magineti: Tekinoroji dzakadai sezvitima zvemaglev dzinoshandisa masimba emagineti pakufamba pasina kukweshana uye nekukurumidza.
5. Magetsi emagetsi evatengi: Zvishandiso zvakaita semafoni, makomputa, uye materevhizheni zvinoshanda zvichienderana nepfungwa dzemagetsi.
mhedziso
Magnetism isimba guru rine basa guru munyika yechisikigo uye tekinoroji yevanhu. Kunzwisisa hwaro hwemagetsi anochaja
