207_test1key_spr11 - Dr. Huerta Phy 207 Test 1 February 16...

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Unformatted text preview: Dr. Huerta Phy 207 Test 1 February 16 2011 Section HJ, MWF 3:35 – 4:25 p. m. Signature: Name: 1 2 3 4 5 ID number: DO PROBLEM [1.] AND DO THREE OUT OF PROBLEMS [2.], [3.], [4.], [5.] CROSS OUT THE BOX OF THE PROBLEM YOU WILL NOT DO Your signature signifies that you will obey the HONOR CODE You may be asked to show your photo ID during the exam. PUT AN X NEXT TO YOUR DISCUSSION SECTION: [ ] Dr. Mezincescu 1O, T 9:30 - 10:20 p.m. [ ] Dr. Alvarez 1Q, T 12:30 - 1:20 p.m. [ ] Dr. Huerta 1R, T 2:00 - 2 :50 p.m. FORMULAE SHEET e = 1 . 6 × 10- 19 C, m e = 9 . 1 × 10- 31 kg, m p = 1 . 67 × 10- 27 kg, k = 1 4 π = 9 × 10 9 N · m 2 C 2 . Coulomb’s Law and Electric Fields: ~ F = q 1 q 2 4 π r 2 , | ~ E Q | = kQ r 2 , ~ F q = q ~ E Electric Field Flux through an area A with unit normal ˆ n : Φ A = ~ E · ˆ nA Gauss’ law for Electric Field: Total outward Electric Field flux through a closed surface Φ closed surface = H ~ E · d ~ A = q inside Electric Field of a sheet of surface charge density σ : E n = σ / 2 ε E n = σ / 2 ε The magnitude of the electric field produced by a large sheet of uniform positive surface charge density σ , near the sheet and far from the edges, is E = σ 2 . Its direction is perpendicular to and away from the sheet on both sides. However, outside the surface of a conductor, E n = σ . Force, Potential Energy and Torque for an Electric Dipole The Force, torque, and potential energy of an electric dipole ~ p immersed in uniform electric field ~ E are ~ F total = 0 , U =- ~ p · ~ E, ~ τ = ~ p × ~ E. Harmonic Oscillator: F x =- kx , ω = p k/m Physics 207 TEST 1 February 16 2011 Dr. Huerta Phy 207 Test 1 February 16 2011 [1.] This problem has five multiple choice questions. The best answers are marked with [X]. [1A.] In the nuclear reaction 15 7 N + 1 1 H → 4 2 He + A Z C , find A and Z . [A] Z = 8 ,A = 16 [X] Z = 6 ,A = 12 [C] Z = 12 ,A = 6 [D] Z = 10 ,A = 20 [E] A = 8 ,A = 12 [1B.] Three point charges are on the x axis. q 1 is at x = 0, q 2 is at x = L , and q 3 is at x = 2 L ....
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This note was uploaded on 01/08/2012 for the course PHYSICS 207 taught by Professor Huerta during the Fall '11 term at University of Miami.

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207_test1key_spr11 - Dr. Huerta Phy 207 Test 1 February 16...

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