Phys122 HW 4: Due Thursday, March 2, 2006 Problems from the Text: Chapter 16 6, 8, 10, 14, 26, 33, 36, 59 (Note: the odd problems from the book have solutions in the back. In order to get credit, you must show your work. Just an answer will get no credit.) What's a field? In this class, we repeatedly refer to an “electric field”. Describe what an electric field is. Discuss how you would know a non-zero field was present and how you would measure it. Tutorial Problem 1. A positive charge might be placed at one of three different locations in a region where there is a uniform electric field, as shown below. How do the electric forces on the charge at positions 1, 2, and 3 compare? Explain why you think so.2. Two identical charges of magnitude q rest at the positions A and B as shown. The electric force felt by charge A due to charge B has magnitude F. Answer each question assuming that the original situation is restored before the change described in the question (i.e., don’t cumulate changes). a. How would the electric force felt by the charge at A change if the charge at B were doubled? Explain why you think so. b. How would the electric field felt by the charge at A change if the charge at B were doubled? Explain why you think so. c. How would the electric field felt by the charge at A change if the charge at A was doubled? Explain why you think so. A
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