The light from a 10mW laser is concentrated on a $2 \mathrm{~mm}^{2}$ are. What is the maximum value of corresponding sinusoidal electric field? $\left(\varepsilon_{0}=8.854 \times 10^{-12} \mathrm{Fm}^{-1} \text { and } \mu_{0}=4 \pi \times 10^{-7} \mathrm{Hm}^{-1}\right)$