Michael Faraday
With the circulation of the chain (i) the magnetic field appears around of its espiras. To the measure that the chain (i) grows in direction to the maximum value, the magnetic field in espiras if expands. To if expanding, the magnetic field in movimen to you generated it in one of espiras cuts espira placed to the side. As Gussow (1985) apud Michael Faraday enunciated, induces one definitive tension in this espira cut by the magnetic field in movement. each espira of the bobbin induces an electric tension in espiras neighboring, being thus, the application of tension in a bobbin provokes the appearance of a magnetic field in expansion that generates in the proper bobbin a induced tension, and this phenomenon is called of self-induction.
The tension generated in the bobbin for self-induction has opposing polarity to the one of the tension that is applied to its terminals. Therefore it is called of contraeletromotriz force (they fcem), that is, when the key of the circuit is closed/on, a tension with one determined polarity is applied to the bobbin. The self-induction generates in the bobbin a induced tension (they fcem) of opposing polarity to the one of the applied tension. 2.3.Indutncia On the basis of the GUSSOW teachings (1985), CARLOS, CESAR and CHOUERI (1996), as the force against-eletromotriz (they fcem) exists only during the variation of the generated magnetic field in the bobbin, when this reaches the maximum value, the con-tra-eletromotriz force (they fcem) leaves to exist and the chain reaches its maximum value. The same phenomenon occurs when the key is off-open. The contraction of the field induces a force against-eletromotriz (they fcem) in the bobbin, being late the decrease of the chain. This capacity of if opposing to the variations of the chain are called of inductance, as the bobbins present inductance, them also are called inductors, these can have the most diverse forms and can also be seemed a transforming one.
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