# OHW 4 - terry(ect328 oldhomework 04 Turner(59130 This...

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terry (ect328) – oldhomework 04 – Turner – (59130) 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. (c) only 4. (a) and (c) 5. (b) only correct 6. (a) and (b) 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 2) 10.0 points The figure below shows the electric field lines for two point charges separated by a small distance. q 1 q 2 What are the signs of q 1 and q 2 ? 1. q 1 > 0 and q 2 > 0 2. q 1 > 0 and q 2 < 0 correct 3. q 1 < 0 and q 2 > 0 4. q 1 < 0 and q 2 < 0 Explanation: Field lines are directed toward negative charges, so q 1 > 0 and q 2 < 0. 003 (part 2 of 2) 10.0 points The ratio R = q 1 q 2 satisfies 1. 0 < R < 1 2. R > 1 3. R < 1 4. 1 < R < 0 correct Explanation: A stronger field is depicted by field lines of higher density, so the magnitude of q 2 is greater than the magnitude of q 1 , and | q 2 | > | q 1 | 1 > | q 1 | | q 2 | > 0

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terry (ect328) – oldhomework 04 – Turner – (59130) 2 Since q 1 < 0 and q 2 > 0, 1 < | q 1 | | q 2 | < 0 1 < q 1 q 2 < 0 .
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