Suppose that 2 electric charges, +QA and +QB, are placed a distance r apart and the electrostatic force between them is measured to be +Fel, as shown in the first line of the table below. Then, the two charges and/or distance are changed as indicated in the table, on 3 separate occasions. Fill in the missing value in the box for each of these cases.

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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.