1. The linear form of carbon dioxide has zero dipole moment, even though it has two polar bonds.
2. In CO2 , there are two polar bonds [C = O], which have dipole moments that are equal in magnitude but have opposite direction.
3. Hence the net dipole moment of the CO2 is µ = µ1 + µ2 = µ1 +( – µ1 ) = 0
4. 
5. In this case
µ = \(\overset{\rightarrow}{\mu_1}\) + \(\overset{\rightarrow}{\mu_2}\) = \(\overset{\rightarrow}{\mu_1}\) + \((-\bar{\mu_1})\) = 0
