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# HW8 - yun(bsy72 Homework 8 Homann(56745 This print-out...

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yun (bsy72) – Homework 8 – Hoffmann – (56745) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A particle with charge q and mass m is un- dergoing circular motion with speed v . At t = 0, the particle is moving along the nega- tive x axis in the plane perpendicular to the magnetic field vector B , which points in the positive z direction in the figure below. x y z vectorv vector B Find the direction of the instantaneous ac- celeration hatwide a at t = 0 if q is negative. 1. hatwide a = ˆ k + ˆ i 2. hatwide a = ˆ k 3. hatwide a = ˆ i 4. hatwide a = ˆ i 5. hatwide a = ˆ j + ˆ k 6. hatwide a = ˆ k 7. hatwide a = ˆ j 8. hatwide a = ˆ j 9. hatwide a = ˆ i + ˆ j 10. hatwide a = ˆ k + ˆ i 002 10.0 points A particle with charge q and mass m is un- dergoing circular motion with speed v . At t = 0, the particle is moving along the nega- tive x axis in the plane perpendicular to the magnetic field vector B , which points in the positive z direction in the figure below. x y z vectorv vector B Find the period T of oscillation; i.e. , the time it takes for the particle to complete one revolution. 1. T = m q B 2. T = q B m 3. T = 2 π m B q 4. T = m B q 5. T = 2 π q B m 6. T = 2 π m q B 003 10.0 points On the right side of the = sign for the choices, there should be the factor qvB. Of course the direction is just the combination of unit vectors in the parentheses: (X +/- Y) A negatively charged particle moving at 45 angles to both the y -axis and z

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