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NCERT Class XII Chapter
Electric Charges and Fields
Questions With Solutions

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Question : 19 of 34
Marks: +1, -0
A point charge of 2.0 μC is at the centre of a cubic Gaussian surface 9.0 cm on edge. What is the net electric flux through the surface?
Solution:  
ϕ = qε0\frac{q}{\varepsilon_0} = 2×10−68.85×10−12\frac{2\times10^{-6}}{8.85\times10^{-12}} = 0.23 × 10610^{6}
or ϕ = 2.3 × 10510^{5} N m2 C−1\mathrm{m}^{2}\,\mathrm{C}^{-1}
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