You are given a point charge Q1 at the origin. Imagine a cube centered at the origin (with the sides crossing the x,y,z axis (4,0,0), (0,4,0), and (0,0,4) with sides parallel to the x,y, and z axis. The space is filled with a material with permittivity of ε.
What is the net electric flux through the x=4 & the value of the divergence of electric flux density D at the point (x=-2,y= 1.5, z=-3)?