To my previous proofs of the inconsistency of the Lorentz force law some have objected with dubious arguments such as: magnetic force on displacement current, magnetic force inside a magnetic shield. Also, my mathematical demonstrations using triangular coils are although exact but too hard to follow. So, I propose a much more intuitive and simpler counter-example here, a 3D folded rectangular coil, Figure 1. Figure 2 is the right view showing the vertical sides BC and CD.

Please read the article at

Self force of a 3D coil http://pengkuanem.blogspot.com/2014/11/self-force-of-3d-coil.html

or Self force of a 3D coil https://www.academia.edu/9413326/Self_force_of_a_3D_coil