You have an equilateral triangle, and it happens you place three charges: q1 = 10 C, q2 =  -70 C, and q3 = 42 C on each vertex and it happens that q2 is place at the center vertex of the equilateral triangle whose sides are equal to 26 fm. What is the total net force experience by q2 due to the other two charges?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.