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I would IMHO say that, speaking about photons (and then generalizing): Newton showed light behaved like particle, while Huygens showed light behaved like wave. Both are/were surely right, since they just showed it! What is understood by "wave behavior" or "particle behavior" might be questioned, but I assume everyone here roughly agrees on what I am ...

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Maxwell's equations in vacuum are symmetric bar the problem with units that you have identified. In SI units $$\nabla \cdot {\bf E} = 0\ \ \ \ \ \ \nabla \cdot {\bf B} =0$$ $$\nabla \times {\bf E} = -\frac{\partial {\bf B}}{\partial t}\ \ \ \ \ \ \nabla \times {\bf B} = \mu_0 \epsilon_0 \frac{\partial {\bf E}}{\partial t}$$ If we let $\mu_0=1$, ...

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In Gaussian units, we set $\epsilon_0 = \frac1{4\pi}$ (and so $\mu_0 = \frac{4\pi}{c^2}$) and change the units of $B$ so both electric and magnetic fields have the same dimension. In these units, Maxwell's equations are as follows: \begin{align} \nabla \cdot \mathbf{E} &= 4\pi \rho \\ \nabla \times \mathbf{E} &= - \frac1{c} \frac{\partial ...

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