For the arrangement below, determine whether the work was needed to assemble the charges into this configuration is positive, negative or zero, assuming they were initially really far away from each other. Include relevant calculations. Explain whether this would change if the signs of the charges were reversed. [Hint: It takes no energy to put the first one in place.]

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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.