A 27mW laser beam has a cross-sectional area of 10mm2. The magnitude of the maximum electric field in this electromagnetic wave is given by:
[Given permittivity of free space ε0=9×10−12SI units, Speed of light c=3×108m/s]
A
2kV/m
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B
0.7kV/m
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C
1kV/m
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D
1.4kV/m
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Solution
The correct option is D1.4kV/m Intensity of an EM wave is, I=PowerArea=12ϵ0E20c