The total electric field is given as Etotal = E0 +E1 +E2 +E3(adsbygoogle = window.adsbygoogle || []).push({});

Where E0 is the applied field, E1 is the depolarization, E2 is caused by polarization of a hypothetical sphere while E3 is the one dependent on lattice geometry... How come E3 is zero for cubic symmetry? Can I picture this as summation of forces? Is the sphere the imagined atom itself?

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# Why is E3 zero for cubic symmetry?

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