The working zone in the interpolar area of the Faraday balance: an approach to testing the magnetic force factor stability criterionAlexander V. Sandulyak, Anna A. Sandulyak, Maria N. Polismakova, Dmitry O. Kiselev, Darya A. Sandulyak and Vera A. ErshovaMATEC Web Conf., 108 (2017) 01007DOI: https://doi.org/10.1051/matecconf/201710801007