A physical quantity $\overrightarrow{\mathrm{S}}$ is defined as $\overrightarrow{\mathrm{S}}=(\overrightarrow{\mathrm{E}}\times \overrightarrow{\mathrm{B}})/{\mu }_0,$ where $\overrightarrow{\mathrm{E}}$ is electric field, $\overrightarrow{\mathrm{B}}$ is magnetic field and μ₀ is the permeability of free space. The dimensions of $\overrightarrow{\mathrm{S}}$ are the same as the dimensions of which of the following quantity (ies) ?