Question

Question No. 12
Three point charges +q ,-2q and +4q as shown in figure The electric flux due to this configuration through the surface s is
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Answer 1

You didn't attach the figure so as per my knowledge of the question I presume that -2q is out of the surface.

Since 4q and q are present in the surface so net charge is 5q.

We know that electric flux is given by

q/ε°

=5q/ε°

I hope this helps you.

Incase you still have doubt feel free to ask.

Answer 2

Answer:

The charge enclosed by the surface is (+2q - q) = q and +3q is not enclosed and will not be a part of flux through S.

Electric flux through the surface S will be as per Gauss law:

= net charge divided 0 = 2q-q divided by 0 = 9 by 0

i wish i helped you if not i am sorry