Answer :

As we know, the electric flux through a surface element ds is


Where,


is the electric field passing through the area


∆S is the area element


θ is the angle between the area element and electric field


The point A and C lie in the straight line with the charge q,


While the points B and D make an angle θ with the area element,


Thus, Electric flux at point A and C is


(θ=0o for the point in the straight line)



Hence, the flux of the electric field through the hemisphere remains unchanged when second charge is placed at point A and C.

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