(a) A dipole with charges ±q and separation d is placed on the y axis as shown in the right figure (p₀ = qd₀). Express the Electric field at the point A to the simplest form with the given constants(d,p,Θ,r). You may use (1 + x)ⁿ ≅ 1 + nx, (x ≪ 1). Also, you can use both cartesian coordinate or polar coordinate.
(b) Another dipole with same charges and separation is placed on the point A. The new dipole forms an angle of θ' with the x axis. Express the torque and potential energy of the dipole with the given letter.