4 charges each with quantity q are placed on the four vertices of a square with its side length a. If the other charge Q is moved from infinity to the center of this square, how much work has been done by external force in this process.
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4 charges each with quantity q are placed on the four vertices of a square with its side length a. If the other charge Q is moved from infinity to the center of this square, how much work has been done by external force in this process.
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