Задача 31008.

Point charges Q1 = 1nC, Q2 = 1nC, Q3 = -1nC, Q4 = -1nC are located on a plane at lattice nodes with a square-shaped cell with side a = 0.1m. The lattice nodes in which the indicated charges are located are specified by radius vectors r1 = (0,0) r2=(a,0), r3=(a,a) r4=(0,a). There are no charges in the remaining nodes. Determine the strength and potential of the electric field at a point with radius vector r=(0,-a)

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