I met some of examples of force in studying classical dynamics, and Lorentz force was represented as $$ \mathbf{F}=\frac{q}{c} \mathbf{\dot{r}} \times \mathbf{B} $$ I've searched for meaning of $c$, but I have no idea. Could anyone please explain it for me?
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1$\begingroup$ The form of the equation you've seen is using cgs-Gaussian units. See this Wikipedia article for more. $\endgroup$– John RennieCommented Oct 25, 2014 at 6:14
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$\begingroup$ @JohnRennie Thanks a lot. I should've checked more. $\endgroup$– D. HanCommented Oct 25, 2014 at 6:20
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You're using Lorentz force in Gaussian Units. The constant $c$ is the speed of light in vacuum.
answered Oct 25, 2014 at 6:12