3. [15 marks] Could the following two functions represent electrostatic fields? (a) F = K(iy+jx) (b) F = K(iy-jx) (HINT calculate the curl and realize that electrostatic fields never curl). 4. [15 marks] An electric field of 500 V/m makes an angle of 30.0 with the surface vector of a total area = 0.500 m. Calculate the electric flux that passes through the surface. 5. [15 marks] Calculate the divergence of an electric described by: E = iCx (x + y2)3/2 + jCy (x + y2)3/2