A 27 mW laser beam has a cross-sectional area of 10 mm2. The magnitude of the maximum electric field in this electromagnetic wave is given by [Take, permittivity of space, εo = 9 × 10-12 SI units and speed of light, c = 3 × 108 m/s]
1
1 kV/m
2
0.7 kV/m
3
2 kV/m
4
1.4 kV/m