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B Dipole moment

  1. Aug 23, 2016 #1
    What does it mean when we say "centre of charges coincide"? What is the physical meaning of dipole moment?
     
  2. jcsd
  3. Aug 23, 2016 #2

    kuruman

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  4. Aug 23, 2016 #3
    I guess you are referring to the explanation of polar and non-polar molecules required for explaining Polarization in dielectrics. If that is the case, then the meaning of "centers of charges coincide" is that the entire molecule is imagined to be like a rigid body . Now we know that in a rigid body the center of mass is the point where the entire mass of the body is supposed to be concentrated. Similarly in a molecule which has multiple charges of two kinds ( positive and negative) we imagine as if the centers of these charges are the points where the charges are concentrated. In absence of electric field these centers overlap on each other for non-polar molecules and are separated in polar molecules . Frankly speaking these are models to describe observed phenomena.
     
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