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Sometimes I am asked to compute the total dipole moment of a charge configuration. Normally you work with dipole moment per unit volume, so you can find the above by integrating over the entire volume, which is quite easy. I'm curius though, what is the physical interpretation of the total dipole moment of a charge configuration? What does this quantity tell us and is it used in any calculations? Like often you find the total dipole moment to be zero - what does that show us?