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