A) \[0.2\,\,N{{C}^{-1}}\,{{m}^{2}}\]
B) \[0.1\,\,N{{C}^{-1}}\,{{m}^{2}}\]
C) \[0.3\,\,N{{C}^{-1}}\,{{m}^{2}}\]
D) \[0.01\,\,N{{C}^{-1}}\,{{m}^{2}}\]
Correct Answer: C
Solution :
Electric flux, \[\phi =E.A\] \[\phi =\frac{1}{4\pi {{\varepsilon }_{0}}}\times \frac{q}{{{r}^{2}}}.\,4\pi {{r}^{2}}=\frac{4\pi q}{4\pi {{\varepsilon }_{0}}}\] \[=9\times {{10}^{9}}\times 8.85\times {{10}^{-13}}\times 4\times \frac{22}{7}\] \[=0.1N{{C}^{-1}}{{m}^{2}}\]
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