Final_summer-0708 - PHYSICS 211 Final TIME: 120 minutes...

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PHYSICS 211 Final TIME: 120 minutes August 12, 2008 DO NOT OPEN THIS EXAM BEFORE YOU ARE TOLD TO BEGIN NAME________________________________________________ ID Number ________________________ Useful information ε 0 =8.85x10 -12 C 2 /N.m 2 . μ 0 =4p x 10 -7 Tm/A. q = 1.6 × 10 19 C m e = 9.1x10 -31 kg. m p = 1.67×10 -27 kg. k e =8.9875x10 9 Nm 2 /C 2 Grading A B TOTAL Score:________ Check if solution is continued on the back. 1
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Part A: Multiple choice questions (36) each question has 3 1. What is the magnetic force on a 2.0-m length of (straight) wire carrying a current of 30 A in a region where a uniform magnetic field has a magnitude of 55 mT and is directed at an angle of 20 ° away from the wire? a. 1.5 N b. 1.3 N c. 1.1 N d. 1.7 N e. 3.1 N 2. A proton is accelerated from rest through a potential difference of 2.5 kV and then moves perpendicularly through a uniform 0.60-T magnetic field. What is the radius of the resulting path? a. 15 mm b. 12 mm c. 18 mm d. 24 mm e. 8.5 mm 3 . A planar loop consisting of four turns of wire, each of which encloses 200 cm 2 , is oriented perpendicularly to a magnetic field that increases uniformly in magnitude from 10 mT to 25 mT in a time of 5.0 ms. What is the resulting induced current in the coil if the resistance of the coil is 5.0 Ω ? a. 60 mA
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Final_summer-0708 - PHYSICS 211 Final TIME: 120 minutes...

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