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There do not always have to be dipole moments. Like in the Molecule H2 there are no dipoles because theoretically the electrons are perfectly shared because the electronegaticities are exactly the same. If there are dipole moments then they would cancel out if they are pulling equally in opposite directions therefore the net dipole would be 0
Molecules do not always have dipoles. A dipole moment only occurs in polar bonds or if an instantaneous dipole induces an instantaneous dipole in another atom. You can tell if a molecule is polar first by determining if its bonds are polar and then looking at whether or not they cancel out because of the shape. Only equal and opposite dipole moments cancel out completely.
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