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Unformatted text preview: Arb, Kellen Homework 15 Due: Oct 6 2004, 4:00 am Inst: Turner 1 This printout should have 13 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 2) 10 points A positively charged particle enters a mag netic field, as shown in the figure below. What is the initial direction of deflection? + + + + + + + + + + B in k j i ^ ^ ^ 1. F = 2. F = + k 3. F = + correct 4. k ~ F k = 0, no deflection 5. F = k 6. F = + 7. F = Explanation: Basic Concepts: Magnetic Force on a Charged Particle: ~ F = q~v ~ B Righthand rule for crossproducts. The force is given by ~ F = q~v ~ B . ~ B = B  k ~v = v (+ ) q > Therefore ~ F = q~v ~ B = q v B h (+ )  k i = q v B (+ ) . 002 (part 2 of 2) 10 points A positively charged particle enters a mag netic field, as shown in the figure below. What is the initial direction of deflection? B 45 k j i + ^ ^ ^ 1. F = + 2. F = 3. F = 4. k ~ F k = 0, no deflection 5. F = + k 6. F = k correct 7. F = + Explanation: ~ B = B 2 [(+ ) + (+ )] ~v = v (+ ) q > Therefore ~ F = q~v ~ B = q v B 2 (+ ) [(+ ) + (+ )] = q v B 2  k . 003 (part 1 of 1) 0 points Given: A long straight wire and a wire loop in the same plane. The long wire has a current flowing in the direction shown. The wire loop is moving in the direction shown. Arb, Kellen Homework 15 Due: Oct 6 2004, 4:00 am Inst: Turner 2 I v wire loop wire straight The current in the loop is flowing 1. There is no current in the loop. 2. clockwise. correct 3. counterclockwise. Explanation: Using the right hand rule, in the fol lowing figure, and taking into considera tion the direction of the magnetic field, we find that the direction of the current flow ing in the loop is as shown in the figure. I v i B 004 (part 1 of 4) 0 points Consider two long parallel wires which are perpendicular to the plane of the paper ( i.e. , the x y plane. See figure). Both wires carry the same current, I . Wire #1 intersects the plane a distance a above point O and wire #2 intersects the plane a distance a below point O . Point C is equidistant from both wires and is a distance a from point O . a a a a O C D wire #2 wire #1 45 45 x y I II III IV O The direction of the magnetic field at C is 1. out of the plane. 2. in quadrant I. 3. in quadrant IV. 4. in the positive y direction. 5. in the positive x direction. correct 6. in quadrant III....
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