The electromagnetic violation of vector current conservation is considered and the strong interaction renormalization of the β-decay coupling constant GV in the presence of electromagnetism is estimated. It is shown that the existing discrepancy between the GV and the μ-decay coupling constant Gμ may be due to such a renormalization. In this demonstration, use is made of a hypothetical scalar particle with isotopic spin unity. This particle has been used as an auxiliary means and the final results do not depend on the parameters of such a particle. It is shown that this particle has interactions with other particles only if the electromagnetic mass splitting of the isotopic multiplets is not neglected. Other properties of this particle are discussed.