In a region, the intensity of an electric field is given by $E = 2i + 3j + k$ in $NC^{-1}$. The electric flux through a surface $S = 10i \ m^2$ in the region is
- A$5 \ Nm^2 C^{-1}$
- B$10 \ Nm^2 C^{-1}$
- C$15 \ Nm^2 C^{-1}$
- D$20 \ Nm^2 C^{-1}$
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