Electric Force Classwork

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Presentation transcript:

Electric Force Classwork Tuesday, August 19, 2014 IB Physics SL Year Two

Question #1 Two 1.0 kg masses are 1.0 m apart on a frictionless surface. Each has +1.0 µC of charge. What is the magnitude of the electric force on one of the masses? 9.0x10-3 N What is the initial acceleration of each mass if they are released and allowed to move? 9.0x10-3 m s-2

Question #2 Two small plastic spheres each have a mass of 2.0 g and a charge of -50.0 nC. They are placed 2.0 cm apart. What is the magnitude of the electric force between the spheres? 5.6x10-2 N By what factor is the electric force on a sphere larger than its weight? 2.8

Question #3 A small plastic sphere with a charge of -5.0 nC is near another small plastic sphere with a charge of -12 nC. If the spheres repel one another with a force of magnitude 8.2x10-4 N, what is the distance between the spheres? 2.6x10-2 m

Question #4 What is the magnitude and direction of the electric force on charge A? 0.0 N, at equilibrium 1.0 nC -1.0 nC 4.0 nC A + B - C + 1.0 cm 1.0 cm

Question #5 Charge q2 experiences no net electric force. What is q1? 8.0x10-9 C q1 -2.0 nC q2 + - + 10 cm 10 cm

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