A laser beam of power $27 \mathrm{mW}$ has a cross-sectional area of $10 {\mathrm{mm}}^2$. The magnitude of the maximum electric field in this electromagnetic wave is given by

$[$Given permittivity of space ${\mathrm{\epsilon }}_0\approx 9\times {10}^{-12} {\mathrm{C}}^2 {\mathrm{N}}^{-1} {\mathrm{m}}^{-2}$, speed of light $\left.\mathrm{c}=3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}\right]$