old hw 4 - linares (jl36797) oldhomework 04 Turner (56705)...

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Unformatted text preview: linares (jl36797) oldhomework 04 Turner (56705) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points The diagrams below depict three electric field patterns. Some of these patterns are physi- cally impossible. Assume these electric field patterns are due to static electric charges outside the regions shown. (a) (b) (c) Which electrostatic field patterns are phys- ically possible? 1. (b) and (c) 2. (a) only 3. (a) and (c) 4. (a) and (b) 5. (c) only 6. (b) only correct Explanation: Electrostatic lines of force do not intersect one another. Neither do they form a closed circuit (unless there is a changing magnetic field present). 002 (part 1 of 4) 10.0 points A good model for a radio antenna is a dipole. In the figure below P 1 is on the perpendic- ular bisector of the dipole, and P 2 is along the axis of the dipole in the direction of the dipole vector p . P 1 and P 2 are both a distance 100 m from the center of the dipole. The magnitude of each of the charges is 5 C . + 1 m vectorp P 2 ( 100 m , 0) P 1 (0 , 100 m) What is the magnitude of the electric field at P 1 ? Hint: The direction of the dipole vector p is from the negative charge to the positive charge. Correct answer: 0 . 0449378 N / C. Explanation: Let : r = 100 m , d = 1 m , and q = 5 C = 5 10 6 C ....
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This note was uploaded on 09/07/2010 for the course PHY 57970 taught by Professor Antoniewicz during the Spring '10 term at University of Texas at Austin.

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old hw 4 - linares (jl36797) oldhomework 04 Turner (56705)...

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