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Unformatted text preview: Version One – Homework 2 – Savrasov – 39819 – Apr 24, 2006 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. Flux Through a Sphere 02 24:01, calculus, numeric, > 1 min, normal. 001 (part 1 of 1) 1 points A spherical shell of radius 7 m is placed in a uniform electric field with magnitude 5000 N / C. Determine the total electric flux through the shell. Correct answer: 0 N · m 2 / C. Explanation: Let : r = 7 m and E = 5000 N / C . The uniform field enters the shell on one side and exits on the other, so the total flux is zero: Φ = I ~ E · d ~ A = . Field From a Charged Plate 01 24:02, calculus, multiple choice, > 1 min, fixed. 002 (part 1 of 5) 1 points A uniformly charged conducting plate with area A has a total charge Q which is positive. The figure below shows a cross-sectional view of the plane and the electric field lines due to the charge on the plane. The figure is not drawn to scale. E E + Q + + + + + + + + + + + P Find the magnitude of the field at point P , which is a distance a from the plate. Assume that a is very small when compared to the dimensions of the plate, such that edge effects can be ignored. 1. k ~ E k = Q ² A 2. k ~ E k = Q 2 ² A correct 3. k ~ E k = Q 4 π ² a 2 4. k ~ E k = Q 4 π ² a 5. k ~ E k = 2 ² Q A 6. k ~ E k = ² Q A 7. k ~ E k = 4 π ² a 2 Q 8. k ~ E k = 4 π ² a Q 9. k ~ E k = ² Q a 2 Explanation: Basic Concepts Gauss’ Law, electrostatic properties of conductors....
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