Module 2 : Electrostatics
Lecture 7 : Electric Flux
  Example 3
An wedge in the shape of a rectangular box is kept on a horizontal floor. The two triangular faces and the rectangular face ABFE are in the vertical plane. The electric field is horizontal, has a magnitude $8\times 10^4$N/C and enters the wedge through the face ABFE, as shown. Calculate the flux through each of the faces and through the entire surface of the wedge.
 

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