A physical quantity \( \vec{S} \) is defined as \( \vec{S} =( \vec{E} \times \vec{B}) / \mu_{0} \), where \( \vec{E} \) is electric field, \( \vec{B} \) is magnetic field and \( \mu_{0} \) is the permeability of free space. The dimension of \( \vec{S} \) are the same as the dimensions of which of the following quantity(ies)?
