A) \[99\times {{10}^{9}}J\]
B) \[9.9\times {{10}^{5}}J\]
C) \[50\text{ }\times {{10}^{9}}\text{ }J\]
D) \[25\times {{10}^{9}}J\]
Correct Answer: A
Solution :
Work done \[={{U}_{f}}-{{U}_{i}}\] \[=\frac{1}{4\pi {{\in }_{0}}}[3\times 2+3\times 1+2\times 1]\left[ \frac{1}{0.5}-\frac{1}{1} \right]\] \[=99\times {{10}^{9}}J\]
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