A) \[1.34\text{ }V/m\]
B) \[2.68\text{ }V/m\]
C) \[5.36\text{ }V/m\]
D) \[9.37\text{ }V/m\]
Correct Answer: A
Solution :
[a] \[{{S}_{av}}=\frac{1}{2}{{\varepsilon }_{0}}cE_{0}^{2}=\frac{P}{4\pi {{R}^{2}}}\] \[\Rightarrow \,\,\,\,\,{{E}_{0}}=\sqrt{\frac{P}{2\pi {{R}^{2}}{{\varepsilon }_{0}}C}}\] \[=\sqrt{\frac{3}{2\times 3.14\times 100\times 8.85\times {{10}^{-12}}\times 3\times {{10}^{8}}}}=1.34\,V/m\]
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