1b) A slab of insulating material of uniform thickness d, lying between -d/2 to +d/2 along the x axis, extends infinitely in the y and z directions, as shown in the figure. The slab has a uniform charge density p. The electric field is zero in the middle of the slab, at 1=0 d P x=+d/2 1=0 x= -d/2 i) Which of the statements is true of the electric field E at the surface of one side of the slab?The direction of E is constant but its magnitude varies across the surface. Both the magnitude and the direction of E are constant across the entire surface. The direction of E varies across the surface but its magnitude is constant. Both the magnitude and the direction of E vary across the surface. ii) What is the angle O that the field E makes with the surface of the slab, which is perpendicular to the x-direction? k) What is Eout, the magnitude of the electric field outside the slab? As implied by the fact that Eout is not given as a function of x, this magnitude is constant everywhere outside the slab, not just at the surface. (express your answer in terms of d, p, and Go) 1) What is Ein(x), the magnitude of the electric field inside the slab as a function of x