... Eq. (55))

Through heuristic arguments, Maeder & Meynet (2004) obtain a similar expression, but where N_t² is reduced by $\varepsilon/2$ instead of $\varepsilon$.

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... force

In fact, one should call it the Laplace force, contrary to what has become common practice. Pierre-Simon Laplace (1749-1827) was the first to give the expression of the force exerted by a magnetic field on an electric current; the force named after Hendrik Lorentz (1853-1928) is that experienced by a moving charged particle.

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