1. Consider a solid circular disc of radius a lying in the xy-plane with its center at the origin and carrying charge of density 47/r C/m. Obtain the expression for the electric field intensity at the point (0,0,z). 2. A circular loop of wire of radius a is situated in the xy-plane with its center at the origin. It carries a current I in the clockwise sense as seen along the positive z-axis (increasing value of o). Obtain the expression for B at a point on z-axis. 3. Find the displacement flux emanating from the following charge distributions: (a) p(x, y, z) = p. (3-x - y-2) for the cubical box bounded by x = 1, y = 1, and z = 1; (b) p(x, y, z) = p. (xyz) for x>0, y>0, z>0 and x + y + z