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Is presented a analysis around the looks that emerged on the potential vector a from the original writings of Faraday and Maxwell. Shown the first ideas on the experiments and on the explanation that were developed on the magnetic induction by Faraday, where is evident a strong influence of this on Maxwell around of the explanation on the induction, as it this rests in the idea of state electro-tónico given by Faraday as a first explanation of phenomenon. The electro-tónico state, Maxwell the characterizes as the state of means by which is executed the magnetics actions through of línes of forcé. Shows that the electro-tonic state is the basis for the explanation of the phenomenon in non-Newtonian terms and the formalizes via the temporal variation of the circulation of the vector potential along a closed path. This type of analysis allows demonstrate the form as these thinkers do a representation of the phenomenon, which no is evidenced in the literature but instead is shown as formalization around of magnetic field. [ABSTRACT FROM AUTHOR]