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Two identical electric point charges that move away from each other are considered. To an observer at rest in a reference frame in which the charges move with equal velocities, the forces exerted by the charges upon each other appear equal in magnitude and opposite in direction, so that there is no net force on the system of the two charges. However, to an observer at rest in a reference frame in which one of the charges is stationary, the two forces appear unequal, so that the charges appeardoi:10.1088/0143-0807/20/1/010 fatcat:h6nq2mqoeng53orfbunzmqqmwa