A flat rectangular surface (a = 4.5 mm and b = 6.0 mm) lies in the horizontal plane in a region of a uniform electric field of 1600 N/C. The electric field makes an angle a = 42.0 with the horizontal. For simplicity, only one field line is shown in the diagram below. E b a (a) What is the electric flux through the surface if the normal to the surface is directed vertically up? 2.89e-2 N- m/c (b) What is the electric flux through the surface if the normal to the surface is directed vertically down? 3.210-2 N-m/C