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Unformatted text preview: mehta (snm425) Homework 4 erskine (58715) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points A charge Q is spread uniformly along the circumference of a circle of radius R . A point charge q is placed at the center of this circle. What is the total force exerted on q as calculated by Coulombs law? 1. Use 2 R for the distance. 2. Use 2 R for the distance. 3. None of these. 4. The result of the calculation is zero. 5. Use R for the distance. 002 10.0 points A solid nonconducting sphere of radius R has a charge Q uniformly distributed throughout its volume. A Gaussian surface of radius r with r < R is used to calculate the magnitude of the electric field E at a distance r from the center of the sphere. Which of the following equations results from a correct application of Gausss law for this situation? 1. E (4 r 2 ) = Q 3 r 3 4 R 2. E (4 r 2 ) = Q 3. E (4 R 2 ) = Q 4. E (4 r 2 ) = Q r 3 R 3 5. E (4 r 2 ) = 0 003 10.0 points A cubic box of side a , oriented as shown, con- tains an unknown charge. The vertically di- rected electric field has a uniform magnitude E at the top surface and 2 E at the bottom surface. a E 2 E How much charge Q is inside the box?...
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