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Figure shows three point charges, $+ 2q,-q$ and $+ 3q$. Two charges $+ 2q$ and $-q$ are enclosed within a surface S. What is the electric flux due to this configuration through the surface S?

Can you answer this question?

$\phi_s= \large\frac{q}{\in_0}$
Hence B is the correct answer.
answered Jun 3, 2014 by