A at surface having an area of 3.2 m2 is rotated in a uniform electric eld of

A flat surface having an area of 3.2 m2 is rotated in a uniform electric field of magnitude E = 6.2 × 105 N/C. Determine the electric flux through this area
(a) When the electric field is perpendicular to the surface and
(b) When the electric field is parallel to the surface.