Four equal positive charges, of magnitude 10-6 C are situated at the corners of  a square, with a length of side equal to 0.25m. A small test charge of 10-9 C is  placed at location X, in the exact center of the square. What is the magnitude  of the potential energy of the test charge and what is the voltage at X?

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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.