A) \[1.2\times {{10}^{-10}}\,J\]
B) \[5.5\times {{10}^{-12}}\,J\]
C) \[2.3\times {{10}^{-10}}\,J\]
D) \[3.6\times {{10}^{-12}}\,J\]
Correct Answer: B
Solution :
[b] Energy density\[=\frac{1}{2}{{\varepsilon }_{0}}E_{0}^{2}=1.1\times {{10}^{-8}}\,J\,{{m}^{-3}}\] Volume of cylinder \[=A\times L=5\times {{10}^{-4}}{{m}^{3}}\] So, required energy\[=1.1\times {{10}^{-8}}\times 5\times {{10}^{-4}}\] \[=5.5\times {{10}^{-12}}J\]
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