[填空题]
Calculate the electric potential due to f3xcn)1s zu3 ma dipole whose dipole mo z:jxt:vy qc6+6dcj f5ment is $ 4.8\times10^{-30 }\,C\cdot m$ at a point $1.1 \times10^{ -9}\,m$ away if this point is
(a) along the axis of the dipole nearer the positive charge; V
(b) 45° above the axis but nearer the positive charge; V
(c) $45^{\circ}\,$ above the axis but nearer the negative charge. V