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Final_A - PHYSICS 1B FINAL FALL QUARTER 2005 A YOUR NAME...

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PHYSICS 1B FINAL FALL QUARTER 2005 A YOUR NAME _________________________________________________________________ YOUR UCSD STUDENT IDENTIFICATION NUMBER_____________________________ INSTRUCTIONS: THERE ARE 30 QUESTIONS ON THIS QUIZ. PLEASE FILL IN THE SCANTRON FORM USING A NUMBER 2 PENCIL. PUT YOUR NAME AND THE IDENTIFICATION NUMBER YOU WERE ASSIGNED IN THE SPACES ABOVE. 1 page of notes is allowed. NO BOOKS CELL PHONES, LAPTOPS ALLOWED. CALCULATORS ARE OK. 1. A deuteron, with the same charge but twice the mass of a proton, moves with a speed of 3.0 10 5 m/s perpendicular to a uniform magnetic field of 0.20 T. Which of the paths described below would it follow? ( q p = 1.6 10 19 C and m d = 3.34 10 27 kg) a. a straight line path b. a circular path of 1.6 cm radius c. a circular path of 3.1 cm radius d. a circular path of 0.78 cm radius 2 A proton, mass 1.67 10 27 kg and charge +1.6 10 19 C, moves in a circular orbit perpendicular to a uniform magnetic field of 0.75 T. Find the time for the proton to make one complete circular orbit. Hint: for uniform circular motion, the angular frequency equals the velocity divided by the radius of the circle. a. 4.3 10 8 s b. 8.7 10 8 s c. 4.9 10 7 s d. 9.8 10 7 s 3. Two long parallel wires 20 cm apart carry currents of 5.0 A and 8.0 A in the same direction. Is there any point between the two wires where the magnetic field is zero?
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