A) \[64.7V/m\]
B) \[57.8V/m\]
C) \[56.72V/m\]
D) \[54.77V/m\]
Correct Answer: D
Solution :
| Intensity of EM wave is given by |
| \[I=\frac{P}{4\pi {{R}^{2}}}={{v}_{a.v}}.c=\frac{1}{2}{{\varepsilon }_{0}}E_{0}^{2}\times c\] |
| \[\Rightarrow \,\,\,\,{{E}_{0}}=\sqrt{\frac{P}{2\pi {{R}^{2}}{{\varepsilon }_{0}}c}}\] |
| \[=\sqrt{\frac{800}{2\times 3.14\times {{(4)}^{2}}\times 8.85\times {{10}^{-12}}\times 3\times {{10}^{8}}}}\] |
| \[=54.77\frac{V}{m}\] |
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