A physical quantity $$\overrightarrow{S}$$ is defined as $$\overrightarrow{S} = \frac{\left(\overrightarrow{E} \times \overrightarrow{B}\right)}{\mu_0}$$, where $$\overrightarrow{E}$$ is electric field, $$\overrightarrow{B}$$ is magnetic field and $$\mu_0$$ is the permeability of free space. The dimensions of $$\overrightarrow{S}$$ are the same as the dimensions of which of the following quantity(ies) ?