Calculate the electric field and then calculate its radient

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Calculate the electric field from four point-charge: +q at -d and -q at -d/2; 2q at d and -2q at d/2 on the z-axis. Calculate the electric field in the z=0, both the term linear in d (the dipole term) and in d^2 (the quadruple term). First calculate the electric potential, and then calculate its radient.

Reference no: EM13243531

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