This came up while I was trying to research the interaction of an electromagnetic plane wave with a dielectric slab, though the issues appear to be more fundamental. The first confusion: An EE"s claim that there is "trouble with the Lorentz law of Force", published in physics review letters. http://arxiv.org/abs/1205.0096 http://arxiv.org/abs/1211.3485 (not PRL, but an EE journal) I don't believe this. (But it's published in genuine peer-reviewed print). The second confusion: A rebuttal by Griffiths, which however relies heavily on "hidden momentum" http://arxiv.org/abs/1205.4646 I would have believed this, but..... The third confusion: A paper by Franklin that debunks hidden momentum (mentioned in another thread). http://arxiv.org/abs/1205.4646 I haven't studied this enough to have a personal opinion yet, but it's a bit dissapointing that there's so much confusion on such basic issues in the literature! Also, I don't know what papers to recommend to students at this point regarding the Lorentz force law issue, nor the starting questing about the interaction of a plane wave with a dielectric slab. (for example, Mansuripur's http://arxiv.org/abs/1401.7057 published in Optics Express, which I'm not familiar with).