Four charges of equal magnitude are placed at corners. The charge at the bottom right corner is +q. The charges at the other three corners are each -q.  (see attached) What is the net electric potential at the exact center of the square due to these 4 charges   a. positive value b. negative value c. zero

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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.