A -4.2 ?C charge exerts an attractive force of 1.8 mN on a second charge which is a distance of 2.4 m away. What is the magnitude and sign of the second charge?These videos are part of a unit of instruction created by NJCTL. Students and teachers can find additional free instruction on this topic at the site listed below. This includes the full unit presentation, homework with solutions, and assessments (teachers only).Electric Charge and Force Presentation - http://njctl.org/courses/science/algebra-based-physics/electric-charge-and-force/electric-charge-and-force-presentation/
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