Net Electric Flux of odd shape (block with piece cut out)?

Mr. StaCcs

New member
http://www.webassign.net/mi3/22-104-HW_prism_sym.jpg

for this shape, i understand that the left hand side would just be (-E)*(depth*height) and the only other nonzero flux contributions would be the sloped side. how would i solve for this?

would i solve for the angle of the cut, and use trig?

E1 = 100 V/m,
E2 = 250 V/m.
I got it.
(for anyone googling for answers)
for right hand side its E*cos(70)*area (then subtract the left hand part of the problem) for flux then that times epsilon_not. where the angle from horizontal would be 20deg.

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