03 2006.11.22

03 2006.11.22 - Physics 122 Name_Section 1 Two long...

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Physics 122 11/22/06 Exam 3 Name____________________________________Section______________ 1. Two long straight parallel wires are located as shown in the diagram. Wire 1 carries a current of 3 I out of the page, while wire 2 carries a current of I into the page. a. Draw and label a vector r B 1 that represents the magnetic field due to wire 1 at the origin. Draw and label a vector r B 2 that represents the magnetic field due to wire 2 at the origin. Be sure to carefully show the proper directions and relative magnitudes, and to place the tail of each vector at the origin. (2 points) b. Determine the magnitude and direction of the magnetic field at the origin. Express your result in terms of any or all of the following: I, a , and fundamental physical and mathematical constants. (12 points) c. Imagine placing at the origin a third long straight parallel wire carrying a current out of the page. On the diagram at right, draw and label a vector r F that represents the direction of the magnetic force on this third wire. Be sure to carefully show the proper direction, and to place the tail of the vector at the origin. (2 points) +x +y (+a, 0) Wire 2 Wire 1 (0, +a) +x +y (+a, 0) Wire 2 Wire 1 (0, +a) (0, 0) Wire 3

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Name____________________________________Section______________ 2. Positive ions (charge = + e ) traveling with velocity r v enter a region in which there is a uniform magnetic field
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This note was uploaded on 07/16/2008 for the course PHYS 122 taught by Professor Anderson during the Fall '07 term at UMBC.

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03 2006.11.22 - Physics 122 Name_Section 1 Two long...

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