p235sp16+exam+1+form+1.pdf - Physics 235 Spring 2016 Exam 1...

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Physics 235 Spring 2016 Exam 1: May 17, 2016 Form 1 Physics 235 Spring 2016: Exam 1 Form #1 You must enter your form number on your scantron. Please Print Your Name:_____________________________________________________ Instructions 1. Fill in your name above 2. Fill in your name , ID number , and form number on your scantron sheet 3. This will be a 90 minute, closed book exam. 4. You may use a calculator, please do not share calculators. 5. The exam includes 20 multiple choice questions which will be machine graded. Each question is worth 5 points. No partial credit will be given. 6. For this exam, you can bring one 3 × 5” index card with any notes you wish to have. You may use a plastic ruler if you wish. You will also find physical constants that you might require listed below. 7. Please take your exam booklet with you and keep it safe and unaltered. 8. Please show your ID when you turn in your exam. Constants you might need: 92 2 9.0 10 Nm / C k 12 2 2 0 8.85 10 C /Nm ε g = 9.8 m/s 2 Proton charge: 19 1.6 10 C e Mass of the proton: 27 1.67 10 kg p m Mass of the electron: 31 9.11 10 kg e m Atomic Mass Unit: 27 1 amu 1.66 10 kg Speed of sound in air v = 340 m/s Speed of light in vacuum c = 3.0 × 10 8 m/s 23 5 1.38 10 J/K 8.62 10 eV/K B k −− 0 °C = 273.15 K 1 electron volt (1eV) = 1.6 × 10 -19 J 23 6.02 10 / mol A N centi (c) = 10 -2 , milli (m) = 3 10 , micro 6 ( ) 10 µ = nano (n) 9 10 = , pico (p) = 12 10 , femto (f) = 15 10 kilo (k) 3 10 = , mega (M) = 6 10 , giga (G) 9 10 = 1 Å=10 -10 m Acquires positive charge Acquires negative charge
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Physics 235 Spring 2016 Exam 1: May 17, 2016 Form 1 Note: Some questions are altered problems you may have seen before. Be sure to read the questions carefully. 1. An electric dipole is made of a positive charge q and a negative charge – q separated by a small distance l , oriented as shown in the picture. A negative point charge – Q is a distance r from the center of the dipole, such that all three charges lie on a line. The distance rl ± . Which is most nearly the magnitude and direction of the electric force on the charge –Q? Hint: You might identify the correct answer, without actually computing it, by eliminating incorrect answers. A. 2 2 kqQ lr to the left B.
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