A) 2 kV/m
B) 0.7 kV/m
C) 1 kV/m
D) 1.4 kV/m
Correct Answer: D
Solution :
Intensity of electromagnetic wave is given by \[I=\frac{Power\,(P)}{Area\,(A)}=\frac{1}{2}{{\varepsilon }_{0}}{{E}^{2}}c\] \[E=\sqrt{\frac{2P}{A{{\varepsilon }_{0}}c}}=\sqrt{\frac{2\times 27\times {{10}^{-3}}}{{{10}^{-5}}\times 9\times {{10}^{-12}}\times 3\times {{10}^{8}}}}\] \[=\sqrt{2}\times {{10}^{3}}V/m=1.4V/m\]You need to login to perform this action.
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