Electrostatics Review A. A B. B C. C D. D

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1 Name: ate: 1. Which sketch best represents the charge distribution around a neutral electroscope when a positively charged strip is brought near, but does not touch, the electroscope? 4. In the diagram here a negatively charged rod approaches a neutral pith ball. In which direction will the pith ball move? particle of aluminum is found to have 13 protons in its nucleus with 10 electrons in orbit around the nucleus. This particle would be 2. negatively charged rod is brought in contact with an electroscope. s the rod gives up electrons, the number of protons in the rod will. decrease. increase. negatively charged. positively charged. electrically neutral. heavier than a normal aluminum atom. remain the same 3. In the diagram, a cloth is brought near, but does not touch a neutral electroscope. The electroscope leaves separate. What charge, if any, does the cloth have?. a positive charge. a negative charge. an unknown charge. no charge 6. Which procedure will give an electroscope a positive charge?. touching the electroscope with a neutral object. bringing a positively charged object near the electroscope. touching the electroscope with a negatively charged object. touching the electroscope with a positively charged object page 1

2 7. Two objects, and, are rubbed together. If object acquires an excess of 100 electrons, object must have. gained 100 electrons. gained 100 protons. lost 100 electrons 10. What is the magnitude of the electrostatic force and between a charge of coulomb and a charge of coulomb separated by 0.30 meter? N N N N. lost 100 protons 8. s shown in the diagram, a charged rod is held near, but not touching, a neutral electroscope. The charge on the knob is 11. When two neutral materials are rubbed together, there is a transfer of electrical charge from one material to the other. The total electrical charge for the system. increases as electrons are transferred. increases as protons are transferred. remains constant as protons are transferred. remains constant as electrons are transferred. positive and the leaves are positive. positive and the leaves are negative. negative and the leaves are positive. negative and the leaves are negative 12. Sphere carries a charge of +2 coulombs and an identical sphere is neutral. If the spheres touch one another and then are separated, the charge on sphere would be What force will a proton experience in a uniform electric field whose strength is newtons per coulomb? N N N N 13. What is the magnitude of the electric field intensity at a point in the field where an electron experiences a 1.0-newton force?. 1.0 N/ N/ N/ N/ page 2

3 14. In the diagram, is a point near a positively charged sphere. Which vector best represents the direction of the electric field at point? proton and an electron traveling with the same velocity enter a uniform electric field. ompared to the acceleration of the proton, the acceleration of the electron is. less, and in the same direction. less, but in the opposite direction. greater, and in the same direction.. greater, but in the opposite direction. 15. Two identical spheres carry charges of +0.6 coulomb and 0.2 coulomb, respectively. If these spheres touch, the resulting charge on the first sphere will be The electrostatic force between two positive point charges is F when the charges are 0.1 meter apart. When these point charges are placed 0.05 meter apart, the electrostatic force between them is. 4F, and attracting.. 4F, and repelling. F, and attracting 4 F, and repelling The diagram shown represents the electric field lines in the vicinity of two isolated electrical charges, and. Which statement identifies the charges of and? 19. n electron is located 1.0 meter from a +2.0-coulomb charge, as shown in the diagram. The electrostatic force acting on the electron is directed toward point. is negative and is positive.. is positive and is negative.. and are both positive and are both negative. page 3

4 20. In the diagram, an electron moving with speed v enters the space between two oppositely charged parallel plates. Which diagram best represents the path the electron follows as it passes between the plates? 22. n inflated balloon which has been rubbed against a person s hair is touched to a neutral wall and remains attracted to it. Which diagram best represents the charge distribution on the balloon and wall? 21. What is the magnitude of the electric force acting on an electron located in an electric field with an intensity of newtons per coulomb? 23. Which graph best represents the relationship between electric field intensity and distance from a point charge? N N N N page 4

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