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Static Electricity Using Coulomb's Law as an "Algebraic Recipe" 11. A balloon with a charge of 4.0 x 10-5 C is held a distance of 0.10 m from a second balloon having the same charge. Calculate the magnitude of the repulsive force. PSYW 12. Calculate the electrical force (in Newtons) exerted between a 22-gram balloon with a charge of -2.6 UC and a wool sweater with a charge of +3.8 uC; the separation distance is 0.75 m. (NOTE: a uC or microCoulomb is a unit of charge; 10 JC =1 C) PSYW 13. Suppose that two equally charged spheres attract each other with a force of -0.492 N ("-" means attractive) when placed a distance of 29.1 cm from each other. Determine the charge of the spheres. PSYW A +5.0 uC charge and a -6.0 uC charge experience an attractive force of -0.72 N ("-" means attractive). Determine their separation distance. PSYW 15. A balloon has been rubbed with wool to give it a charge of + + + + + + + + + -1.0 x 10-6 C. A plastic tube with a charge of +4.0 x 10-6 C is held a distance of 0.50 m above the balloon. Determine the electrical force of attraction between the tube and the balloon. PSYW In the space at the right, construct a free-body diagram showing the direction and the type of all forces acting upon the 30.0-gram balloon. O Will the balloon accelerate up, down, or not at all? If there is an acceleration, then calculate its value. (Assume that the plastic tube is held a constant distance of 0.5 m from the balloon.) PSYW The Physics Classroom, 2020 Page 14