3- A positive charge q is uniformly distributed over the area of a disk, of radius R, placed horizontally on the x-y plane as shown in the figure. a) Find an expression for the charge density o. b) Find an expression for the electric potential at a point P on the axis passing through the center of the disk and at a distance z from its center. c) Check that your formula is consistent with what you would expect for the case when z→ ± 0

3- A positive charge q is uniformly distributed over the area of a disk, of radius R, placed horizontally on the x-y plane as shown in the figure. a) Find an expression for the charge density o. b) Find an expression for the electric potential at a point P on the axis passing through the center of the disk and at a distance z from its center. c) Check that your formula is consistent with what you would expect for the case when z→ ± 0