Solution to task 305 from Chertov´s for extramural stud

Solution to task 305 from Chertov´s for extramural stud

305. Four identical charges Q1 = Q2 = Q3 = Q4 = 40 nC are fixed at the vertices of a square with a side a = 10 cm. Find the force F acting on one of these charges from the other three.

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