A) \[2\text{ }mC\]
B) \[2\times {{10}^{-7}}C\]
C) \[2\text{ }nC\]
D) \[2\mu C\]
Correct Answer: D
Solution :
Coulomb force is given by \[F=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{{{q}_{1}}{{q}_{2}}}{{{r}^{2}}}\] \[\therefore \]\[(10\times {{10}^{-3}})\times 10=\frac{(9\times {{10}^{9}})\times {{q}^{2}}}{{{(0.6)}^{2}}}\] \[[\because {{q}_{1}}={{q}_{2}}=q]\] or \[{{q}^{2}}=\frac{{{10}^{-1}}\times 0.36}{9\times {{10}^{9}}}\] \[=4\times {{10}^{-12}}\]
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