I need help with the following question about dipoles

A thin ring with radius R is placed on the xy plane. The line charge density on the ring is xed and distributes as 21 cos (p (where it > 0 and the go is the counterclockwise rotational angle from the +x direction). 3) Draw a 2D sketch of the ring on the xy plane, and indicate which side of the ring carries positive charge. b) Calculate the electric dipole moment vector of the ring. c) Using spherical coordinates, dene the direction of the polar axis, then write down the electric potential at an arbitrary point that is at a distance r from the origin (1' >> R). Express your result as a function of A, R, "r, 6' (Do NOT use vectors 33 or F in your result.) d) Write down the electric potential at a point (x, y, Z) that is much farther from the origin than R. Express your result as a function of )l,R,x, y,z. (Do NOT use vectors p or F in your result.)