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Calculating Electric Force. Calculating the force between any two particles involves the equation If more than two particles are present, you calculate individual forces and algebraically combine them. k = 9.0 x 10 9 N • m 2 / C 2. Instruction.
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Calculating Electric Force • Calculating the force between any two particles involves the equation • If more than two particles are present, you calculate individual forces and algebraically combine them. k = 9.0 x 109 N • m2 / C2
Instruction • Two charges of +9 µC and +6 µC are placed 0.15 meters apart. What is the magnitude of the force between the two particles? Is it an attractive or repulsive force? • NOTE: µC means microCoulomb and is 10-6 Coulombs.
Practice • Two charges of -12 µC and +9 µC are placed 0.38 meters apart. What is the magnitude of the force between the two particles? Is it an attractive or repulsive force?
Instruction for 3 charges • Two charges of -20 µC and -13 µC are placed 0.5 meters apart. A third charge of +25 µC is placed 0.8 meters below the -20 µC charge. What is the magnitude and direction of the NET force experienced by the -20 µC particle?
Practice for 3 charges • Two charges of -40 µC and +20 µC are placed 0.9 meters apart. A third charge of +45 µC is placed 0.4 meters below the -40 µC charge. What is the magnitude and direction of the NET force experienced by the +20 µC particle?
Instruction for 3 charges • Three charges of +25 µC, -40 µC and -38 µC are placed 0.5 meters apart at the vertices of an equilateral triangle starting at the top and moving clockwise. What is the magnitude and direction of the force experienced by the -40 µC charge?
Practice for 3 charges • Three charges of +30 µC, +45 µC and -60 µC are placed 0.7 meters apart at the vertices of an equilateral triangle starting at the top and moving clockwise. What is the magnitude and direction of the force experienced by the -60 µC charge?