A plane electromagnetic wave travels in a medium of relative permeability 1.61 and relative permittivity 6.44. If magnitude of magnetic intensity is $4.5\times {10}^{-2}{\mathrm{Am}}^{-1}$ at a point, what will be the approximate magnitude of electric field intensity at that point ?
(Given : permeability of free space ${\mathrm{\mu }}_0=4\mathrm{\pi }\times {10}^{-7}$ ${\mathrm{NA}}^{-2}$, speed of light in vacuum c $=3\times {10}^8{ \mathrm{ms}}^{-1}$ )