A) \[64\times {{10}^{5}}J/{{m}^{3}}\]
B) \[8\times {{10}^{3}}J/{{m}^{3}}\]
C) \[32\,J/{{m}^{3}}\]
D) \[2.83\,J/{{m}^{3}}\]
Correct Answer: D
Solution :
Energy density \[{{u}_{e}}=\frac{1}{2}{{\varepsilon }_{0}}{{E}^{2}}=\frac{1}{2}\times 8.86\times {{10}^{-12}}\times {{\left( \frac{V}{r} \right)}^{2}}\] \[=2.83J/{{m}^{3}}\]
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