This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: 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? a. yes, midway between the wires b. yes, 12 cm from the 5-A wire c. yes, 7.7 cm from the 5-A wire d. no 4. There is a current I flowing in a clockwise direction in a square loop of wire that is in the plane of the paper. If the magnetic field B is toward the right, and if each side of the loop has length L , then the net magnetic torque acting on the loop is: a. 2 ILB b. ILB c. IBL 2 d. zero B I L 5. The current in a coil with an inductance of 1.5 mH increases from 0 to 1.0 A in a tenth of a second. What is 5....
View Full Document