We can define a vector called the dipole moment(电矩) NOTE: This p has q)→(+q nothing to do with momentum! Magnitude: qc Direction: from the negative(-)charge to the positive(+)charge-q +q d p  We can define a vector called the dipole moment (电矩). Magnitude: Direction: from the negative (-) charge to the positive (+) charge. p = qd  NOTE: This p has nothing to do with momentum!