A) \[2\times {{10}^{-11}}coulomb\]
B) \[3\times {{10}^{-11}}coulomb\]
C) \[5\times {{10}^{-11}}coulomb\]
D) \[9\times {{10}^{-11}}coulomb\]
Correct Answer: A
Solution :
Electric field due to a point charge \[E=\frac{q}{4\pi {{\varepsilon }_{0}}{{r}^{2}}}\] \ \[q=E\times 4\pi {{\varepsilon }_{0}}{{r}^{2}}=2\times \frac{1}{9\times {{10}^{9}}}\times {{\left( \frac{30}{100} \right)}^{2}}\]= 2 ´ 10?11 C
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