2D and 3D fault basis for fuel cell diagnosis by external magnetic field measurements Lyes Ifrek, Gilles Cauffet, Olivier Chadebec, Yann Bultel, Sébastien Rosini and Luc Rouveyre Eur. Phys. J. Appl. Phys., 79 2 (2017) 20901 Published online: 10 July 2017 DOI: 10.1051/epjap/2017160468