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Coulomb’s Law Problems 1. A balloon rubbed against denim gains a charge of -8.0 μC. What is the electric force between the balloon and the denim when they are separated by a distance of 5.0 cm. 2. A small cork with an excess charge of +6.0 μC (1mC = 10-6C) is placed 0.12m from another cork, which carries a charge of -4.3 μC. a. What is the magnitude if the electric force between the corks? b. Is this force attractive or repulsive? c. How many excess electrons are on the negative cork? d. How many electrons has the positive cork lost? 3. Two electrostatic point charges of +60 μC and +50 μC exert a repulsive force on each other of 175 N. What is the distance between the two charges? 4. Four charged particles are placed so that each particle is at the corner of a square. The sides of the square are 15 cm. The charge at the upper left is +3.0 μC, the charge at the upper right corner is -6.0 μC, the charge at the lower left is corner is -2.4 μC, and the charge at the lower right is -9.0 μC. a. What is the net electric force on the +3.0 μC charge? b. What is the net electric force on the -6.0 μC charge? c. What is the net electric force on the -9.0 mC charge?
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