Homework.docx - Homework Focus on Concepts Section 18.1 The Origin of Electricity 1 An object carries a charge of while another carries a charge of How

# Homework.docx - Homework Focus on Concepts Section 18.1 The...

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Homework Focus on Concepts: Section 18.1 The Origin of Electricity 1. An object carries a charge of , while another carries a charge of . How many electrons must be transferred from the first object to the second so that both objects have the same charge? Section 18.2 Charged Objects and the Electric Force 2. Each of three objects carries a charge. As the drawing shows, objects A and B attract each other, and objects C and A also attract each other. Which one of the following statements concerning objects B and C is true? a. They attract each other. b. They repel each other. c. They neither attract nor repel each other. d. This question cannot be answered without additional information. Section 18.4 Charging by Contact and by Induction 4. Each of two identical objects carries a net charge. The objects are made from conducting material. One object is attracted to a positively charged ebonite rod, and the other is repelled by the rod. After the objects are touched together, it is found that they are each repelled by the rod. What can be concluded about the initial charges on the objects? a. Initially both objects are positive, with both charges having the same magnitude. b. Initially both objects are negative, with both charges having the same magnitude. c. Initially one object is positive and one is negative, with the negative charge having a greater magnitude than the positive charge. d. Initially one object is positive and one is negative, with the positive charge having a greater magnitude than the negative charge.

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5. Only one of three balls A, B, and C carries a net charge q . The balls are made from conducting material and are identical. One of the uncharged balls can become charged by touching it to the charged ball and then separating the two. This process of touching one ball to another and then separating the two balls can be repeated over and over again, with the result that the three balls can take on a variety of charges. Which one of the following distributions of charges could not possibly be achieved in this fashion, even if the process were repeated a large number of times? a. b. c. d. Ans: 1. 2. B 4. D 5. C Problems: Section 18.4 Charging by Contact and by Induction 1. Iron atoms have been detected in the sun's outer atmosphere, some with many of their electrons stripped away. What is the net electric charge (in coulombs) of an iron atom with 26 protons and 7 electrons? Be sure to include the algebraic sign ( or ) in your answer.
• Fall '16
• Resistor, Electric charge

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