An electric eld of magnitude 3.5 kN/C is applied along the x axis. Calculate the electric flux through a rectangular plane 0.35 m wide and 0.7 m long in the following cases.
(a) The plane is parallel to the yz plane.
(b) The plane is parallel to the xy plane.
(c) The plane contains the y axis and its normal makes an angle of 40:0 with the x axis.