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Pre-lab EM-1 Investigation in Electrostatics Read the chapter about electric charge in the textbook and answer the following questions: Read lab manual EM-1 thoroughly. 1. A neutral body means: a. b. c. There is no charge in the body The is no electron in the body. The numbers of positive charge and negative charge in the body are the same. 2. An electric insulator is a material a. b. c. d. contains no electrons that has less electrons than protons on its surface. through which electrons do not flow easily. that has less electrons than protons in its body. 3. A conductor is a material has more electrons than protons in its body. has more electrons than protons on its surface. has nearly free atoms. has nearly free electrons. a. b. c. d. When two insulations are rubbed together, some electrons from one body may be moved to the other. The two neutral bodies then become charged. One carries a net charge of positive sign, the other carries a net charge of negative sign. Which body carries what kind the charge depending on the properties of the materials Two neutral insulators were rubbed against each other. It was measured that one of the bodies now carries a charge of 6.0 uC. The charge on the other body: 4. a. should be 6.0 uC. b. should be 6.0 uC. c. should be 0.0 HC. d. cannot be determined. When a charge body is brought close to a neutral conductor, the free electrons in the conductor will be moved due to the electric field caused by the charged body. 5. A positively charges rod is brought near a piece of conductor. The conductor is attracted toward the glass rod. Which of the following correctly describe the situation? The conductor now carries a net negative charge on it. An electric field is present around the conductor due to the charge rod and the conductor now carries a net positive charge. the charges in the conductor is redistributed so one end has more negative charges than the other end. a. b. c.

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