A) \[1.6\times {{10}^{-9}}J\]
B) \[2.1\times {{10}^{-9}}J\]
C) \[5\times {{10}^{-9}}J\]
D) \[7\times {{10}^{-9}}J\]
Correct Answer: B
Solution :
There are two capacitors parallel to each other. \ Total capacitance\[=\frac{2{{\varepsilon }_{0}}A}{d}\] \Energy stored \[=\frac{1}{2}\left( \frac{2{{\varepsilon }_{0}}A}{d} \right)\,{{V}^{2}}\] \[=\frac{8.86\times {{10}^{-12}}\times 50\times {{10}^{-4}}\times {{12}^{2}}}{3\times {{10}^{-3}}}=2.1\times {{10}^{-9}}J\]You need to login to perform this action.
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