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Physics 12 Online
OpenStudy (anonymous):

Two charged balloons 2.1 × 10-1 meters apart have a repulsive force of 1.3 × 10-1 newtons. The charge on one balloon is 8.2 × 10-7 coulombs. What is the charge on the other balloon? (k = 9.0 × 109 newton·meters2/coulomb2)

OpenStudy (anonymous):

Remember Coulomb's Law:\[F=k \frac{ q _{1} q _{2}}{ r ^{2} }\]where F is the force due to charges q1 and q2; k is a constant; and r is the distance between the two charges. Now look at what the problem gives you. It gives the distance between the two charges (the two charged balloons); it gives you the force due to those charges; and it gives you the constant; and it gives you one of the charges. Do you see, now, how to solve the problem?

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