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Unformatted text preview: Magnetic Field near a Moving Charge A particle with positive charge is moving with speed along the z axis toward positive . At the time of this problem it is located at the origin, . Your task is to find the magnetic field at various locations in the threedimensional space around the moving charge. Part A Which of the following expressions gives the magnetic field at the point due to the moving charge? A. B. C. Picture 1 Picture 12 Picture 13 Picture 14 Picture 15 Picture 16 Picture 17 Picture 18 Magnetic Field near a Moving Charge Part A D. ANSWER: A only B only C only D only both A and B both C and D both A and C both B and D Correct The main point here is that the rdependence is really . The results from using in the numerator rather than the unit vector . A second point is that the order of the cross product must be such that the righthand rule works: If Magnetic Field near a Moving Charge Part A your right thumb is along the direction of the current, , your fingers must curl along the direction of the magnetic field. Part B Find the magnetic field at the point . Hint B.1 Hint not displayed Express your answer in terms of , , , and , and use , , and for the three unit vectors. ANSWER: = Correct Part C Find the magnetic field at the point . Express your answer in terms of , , , , and , and use , , and for the three unit vectors. ANSWER: = Correct Part D Find the magnetic field at the point . Hint D.1 Magnetic Field near a Moving Charge Part C Hint not displayed Hint D.2 Hint not displayed Express your answer in terms of , , , , , and , and use , , and for the three unit vectors. ANSWER: = Correct Part E The field found in this problem for a moving charge is the same as the field from a current element of length carrying current provided that the quantity is replaced by which quantity? Hint E.1 Making a correlation Hint not displayed ANSWER: Correct Problem 32.6 An electron moves along the yaxis with . As it passes the origin, what is the strength of the magnetic field at the following positions? Part A (0 cm, 1 cm) ANSWER: 0.0 Correct T Part B (1 cm, 0 cm) ANSWER: Part C (1 cm, 1 cm) ANSWER: 5.66×10 16 − Correct T PSS 32.1: The Current Loophole Learning Goal: To practice ProblemSolving Strategy 32.1 for problems involving the magnetic field of a current. A long wire carries current . The wire is straight except for one squareshaped "halfloop" KLMN as PSS 32.1: The Current Loophole shown. Find the magnitude and the direction of the magnetic field at point P. Assume that is a known quantity. MODEL: Model the wire as a simple shape, such as a straight wire or a loop. VISUALIZE: For the pictorial representation: 1. Draw a picture and establish a coordinate system....
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This note was uploaded on 04/18/2010 for the course PHYS ? taught by Professor Zhou during the Spring '10 term at Georgia State University, Atlanta.
 Spring '10
 ZHOU

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