Solution to task 306 from Chertov's for extramural stud

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• Point charges Q1 = 30 µC and Q2 = -20 µC are at a distance d = 20 cm from each other. Determine the strength of the electric field E at a point remote from the first charge at a distance r1 = 30 cm, a from the second - at r2 = 15 cm.