Four identical charges each having equal charge of +q are located on the corners of a square of a side length L, as shown in figure below . What is the force acting on q4 by a fifth charge q5 to stay q4 stationary ?

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Q: equilateral triangle

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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.