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Unformatted text preview: Rodriguez, Brandon Homework 12 Due: Oct 3 2006, 11:00 am Inst: Andrew J Rader 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. Please notice that for your homework to be considered towards your grade, it needs to be submitted one hour before the corresponding recitation starts. Work submitted after this time, but before the DUE DATE on top of this page, will be accepted but not graded. PLEASE REMEMBER THAT YOU MUST CARRY OUT YOUR CALCULA- TIONS TO AT LEAST THREE SIGNIFI- CANT FIGURES. YOUR ANSWER MUST BE WITHIN ONE PERCENT OF THE CORRECT RESULT TO BE MARKED AS CORRECT BY THE SERVER. 001 (part 1 of 1) 2 points A negatively charged particle moving paral- lel to the z-axis enters a magnetic field (point- ing into of the page), as shown in the figure below. z x v y ~ B ~ B- q Figure: is in the x-direction, is in the y-direction, and k is in the z-direction. What is the initial direction of deflection? 1. ~ F = 0; no deflection 2. b F =- k 3. b F = + k 4. b F = + 5. b F = + correct 6. b F =- 7. b F =- Explanation: Basic Concepts: Magnetic Force on a Charged Particle: ~ F = q~v ~ B Right-hand rule for cross-products. b F ~ F k ~ F k ; i.e. , a unit vector in the F direc- tion. Solution: The force is ~ F = q~v ~ B . ~ B = B (- ) , ~v = v - k , and q &lt; , therefore , ~ F =-| q | ~v ~ B =-| q | v B h- k (- ) i =-| q | v B (+ ) b F = + . This is the seventh of eight versions of the problem. keywords: 002 (part 1 of 1) 2 points A negatively charged particle moving at 45 angles to both the z-axis and x-axis enters a magnetic field (pointing into of the page), as shown in the figure below. z x v y ~ B ~ B- q Figure: is in the x-direction, is in the y-direction, and k is in the z-direction. Rodriguez, Brandon Homework 12 Due: Oct 3 2006, 11:00 am Inst: Andrew J Rader 2 What is the initial direction of deflection? 1. b F = 1 2 - - k 2. b F = 1 2 - - k 3. b F = 1 2 + + k 4. b F = 1 2 (+ - ) 5. b F = 1 2 (+ + ) 6. b F = 1 2 (- - ) 7. b F = 1 2 + - k 8. b F = 1 2 + + k correct 9. b F = 1 2 + - k 10....
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This note was uploaded on 10/18/2010 for the course PHYSICS 251 taught by Professor Pedon during the Spring '08 term at IUPUI.
- Spring '08