JEE Main & Advanced
Physics
EM Waves
JEE PYQ-Electro Magnetic Waves
question_answer
A 27 mW laser beam has a cross-sectional area of\[10\text{ }m{{m}^{2}}\]. The magnitude of the maximum electric field in this electromagnetic wave is given by [Given permittivity of space\[{{\varepsilon }_{0}}=9\times {{10}^{-12}}\] SI units, speed of light \[c=3\times {{10}^{8}}m/s\]] [JEE Main 11-Jan-2019 Evening]