Calculate the electric potential due to a dipole whose dipole moment is 4.2 × 10-30 C∙m at a point 2.4 × 10-9 m away if this point is

(a) Along the axis of the dipole nearer the positive charge;

(b) 45° above the axis but nearer the positive charge;

(c) 45° above the axis but nearer the negative charge.