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old hw 4 - linares(jl36797 – oldhomework 04 – Turner...

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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 ˆ 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 μ 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 ˆ 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 μ C = 5 × 10 − 6 C ....
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old hw 4 - linares(jl36797 – oldhomework 04 – Turner...

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