Question

calculate the total electric flux leaving the cubical surface formed by the six planes x,y, z=5 if the charge distribution is (a) two point charges, 0.1 microcoloumb

Answer 1

Heyy...
Here is your answer.

See the picture for your better concept.


Hope it helps.
Thank you.

Answer 2

Answer: Φ = 22598 Wb

Two charges of 0.1 micro coulomb is present, the total flux leaving the cubical surface in 6 planes are to be calculated, then we need apply Gauss theorem.  

By Gauss theorem,

∮E.ds$=\frac { q }{ \epsilon _{ 0 } }$, this is valid for any closed surface.

There by total flux is calculated by Φ$=\frac { q }{ \epsilon_0 }$,

Total flux, Φ$=\frac { q }{ { \epsilon }_{ 0 }{ \epsilon }_{ r } }$

$=\frac { 2\quad \times \quad 0.1\quad \times \quad { 10 }^{ -6 } }{ 1\quad \times \quad 8.85\quad \times \quad { 10 }^{ -12 } }$

Total flux, Φ = 22598 Wb