A) 5.8 J
B) 5.8 eV
C) 13 J
D) 13 eV
Correct Answer: C
Solution :
\[W={{U}_{f}}-{{U}_{i}}\] \[=9\times {{10}^{9}}\times {{q}_{1}}{{q}_{2}}\left[ \frac{1}{{{r}_{1}}}-\frac{1}{{{r}_{2}}} \right]\] \[=9\times {{10}^{9}}\times 12\times {{10}^{6}}\times 8\times {{10}^{-6}}\] \[\left[ \frac{1}{4\times {{10}^{-2}}}-\frac{1}{10\times {{10}^{-2}}} \right]\] \[=12.96J\] \[W=13J\]
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