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### Relatorio de fisica 123

Course: DAMEC 32, Spring 2011
School: Federal University of...
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Word Count: 312

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Fsica Relatrio 3 1. Ttulo Osciloscpio / auto-indutncia de um solenide. 2. Objetivos - Realizar medidas de tenso e corrente de um circuito de CA usando um osciloscpio; - medir a resistncia e a auto-indutncia de uma solenide. 3. Introduo terica 3.1. Osciloscpio O osciloscpio um instrumento utilizado para observa, analisar e quantifcar sinais eltricos que variam com o tempo. Em geral, num osciloscpio, o eixo...

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Fsica Relatrio 3 1. Ttulo Osciloscpio / auto-indutncia de um solenide. 2. Objetivos - Realizar medidas de tenso e corrente de um circuito de CA usando um osciloscpio; - medir a resistncia e a auto-indutncia de uma solenide. 3. Introduo terica 3.1. Osciloscpio O osciloscpio um instrumento utilizado para observa, analisar e quantifcar sinais eltricos que variam com o tempo. Em geral, num osciloscpio, o eixo horizontal (eixo X) representa o eixo do tempo e o eixo vertical (eixo Y) a tenso elctrica. Figura 1 tela de um osciloscpio. Na figura esta representada as subdivises que o osciloscpio possui As incertezas do aparelho a da medio (m) e de calibragem ( c ) so calculadas da seguintes forma: = c + m (1) Como o erro de medio o erro de leitura e o este a metade da menor diviso (u/2) e u=0,2mV/DIV e, o erro de calibrao pode ser igual considerado ao erro da medio, o a incerteza pode ser escrita como: = u2 2 (2) 3.2. Auto-indutncia Quando a corrente que atravessa um indutor Vaira, o fluxo magntico que atravessa as espiras tambm varia, o que significa de acordo com a lei de Faraday, que uma fora eletromotriz induzida aparece no indutor, isso conhecida como autoinduo, e a fora eletromotriz recebe o nome de fora eletromotriz auto-induzida e esta obedece a lei de Faraday. Uma bobina helicoidal formada por espiras circulares muitos prximas chamada de solenide. O campo magntico de um solenide a soma vetorial dos campos produzidos pelas espiras. 4. Mtodos experimentais 5. Analise dos resultados 6. Concluso 7. Referncias Bibliogrficas HALLIDAY, D., RESNICK, R., WALKER, J. Fundamentos da Fsica Vol 3 So Paulo: Livres Tcnicos e Cientficos Editora, 8 Edio, 2009
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Federal University of Technology - DAMEC - 32
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Federal University of Technology - DAMEC - 32
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Federal University of Technology - DAMEC - 32
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Federal University of Technology - DAMEC - 32
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