Electric Charges And Fields

Physics
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A cubical region of side a has its centre at the origin. It encloses three fixed point charges, -q
at (0, -a/4, 0), +3q at (0, 0, 0) and -q at (0, +a/4 ,0). Choose the correct option(s):

A
The net electric flux crossing the plane x = +a/2 is equal to the net electric flux crossing the plane x = -a/2
B
The net electric crossing the plane y = +a/2 is more than the net electric flux crossing the plane y = -a/2
C
The net electric flux crossing the entire region is
D
The net electric flux crossing the piane z = +a/ 2 is equal to the riet electric flux crossing the piane x = +a/2
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A few electric field lines for a system of two charges and fixed at two different points on the -axis are shown in the figure. These lines suggest that

A
B
C
at a finite distance to the left of the electric field is zero
D
at a finite distance to the right of the electric field is zero
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A point charge is placed just outside an imaginary hemispherical surface of radius as shown in the figure. Which of the following statements is/are correct? 

A
The electric flux passing through the curved surface of the hemisphere is
B
The component of the electric field normal to the flat surface is constant over the surface
C
Total flux through the curved and the flat surface is
D
The circumference of the flat surface is an equipotential
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