Ex1Bb - Name Student ID Number last first 123 Section B...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Name Student ID Number last first 123 Section B exam Write your name and student number on all five pages. Problem VI asks for a written answer——be concise yet complete, and write legibly. T 0 receive credit, you must briefly explain the major steps you take, “naked” answers receive none. Your job is to convince the grader that you know what you are doing. In answering multiple—choice questions, choose the best response. Problem I Faraday’s Law [15 points] The resistance of the square loop at the right is 0.001 Q, l W '- and a 0.150 A induced current is flowing ccw as shown. 1. (2 pts) The externally applied magnetic field strength is 8‘0 cm A. adequate B. decreasing ©increasing D. constant 2. (3 pts) What is the magnitude of the induced emf (in millivolts)? .0150 B. 15.0 C. 1.50 D. 0.50 E. 3.68 3. (5 pts) What is the direction of the induced B-field? A. cw B. ccw C. can’t be determined D. into the page @ out of the page 4. (5 pts) At what rate (in T/s) is B changing? 0.0234 B. 2.34 C. 1.60 D. 0.50 E. 0.234 Problem 11 Motional EMF [15 points] A 30.0—cm long conducting rod moves in a plane that is perpendicular to a magnetic field of 0.050 T. The constant speed v of the rod is perpendicular to its length. 5. (5 pts) When charge distribution is not changing, the magnitude of the electric field in the rod is given by A.E=0.00 E=vB C.E=le D. E = Q/(4n&)l ) E. none of these 6. (5 pts) If the potential difference between the ends measures 8.00 V, then v (in m/s) is A. 400 B. 40 c. 160 533 E. 3.68 7. (5 pts) What force (in N) is require 0 keep the rod moving at speed v? 0.00 B. 0.98 C. 1.60 D. 0.50 E. 3.68 Physics 1233, Winter 2009, Version b Exam 1, page 1 Name Student ID Number last first Problem III. Response of an RL circuit [5 pts] 8. (5 pts) The open switch in the RL L R l circuit shown on the right is closed at l—rmmg—Jm time t = 0. Which curve best illustrates the variation of the magnitude of the 8 current through the inductor as a [M function of time? Battery A. 9 C. D. E. Problem VI. Another RL Circuit?! [10 points] For this second RL circuit shown on the right, the switch is 10 n 20D 10 mH initially open. ‘E/ + 9. (5 pts) What is the current I (in A) through the 10 Q m V resistor immediately after the switch is closed? 2.00 B. 0.50 C. 1.00 D. 2.50 E. 3.00 10. (5 pts) What is the current I (in A) through the 10 Q resistor a very long time after the switch is closed? .00 B. 0.50 C. 1.00 D. 2.50 E. 3.00 Problem V. RC response time [5 points] 11. (5 pts) Rank RC time constants of the three RC circuits below from largest to smallest. All resistors and capacitors have the same value. A. A. 123 B. 321 C. 312 @213 E. 231 Physics 1233, VWnter 2009, Version b Exam 1, page 2 Name Student ID Number last first Problem VI. Driven RLC oscillator [30 points] This circuit is driven with 5 E 6' = 200 Vat resonance. 5 COS w, peak 0 0 R = 20.0 9, L = 2.00 H, C = 2.00 11F, and recall that [peak = W ah / Z is a maximum at resonance. 12. (5 pts) Argue that the impedance Z, defined as «I? + (XL — X C )2 , must equal the value of R at the resonant fre uency. IMU & I; 4 awrin 42L Mommas: {2 mar-2‘ \oea MlmWIM.'TZu$ \nefwws XLzXc) So £- :JP-= R 13. (5 pts) Calculate the value of [peak Imk 'TZMI‘ = figs-10.04 4+ Mom 14. (5 pts) Determine the value of the resonant frequency beginning with the definitions of X L and XC in terms of a), L, and C. 1 .. .1. II,_ t g .—L- .. .. 0‘5 4%, = "LB "‘ (2.0Hwaw’3F $0063 " 6”” H3 ’é’k. 15. (10 pts) Evaluate X L and XC, then VL peak and V0 peak, and compare their values to VRpeak XL =5q,‘ L = Phi/fan. 0H: MUd-Qfi-AE a: slum aha-0k {/ka =XL IML= loavnxxam =/0A V: {Iméz‘ ‘50 XL=X¢= moon. W VLPafiéwp/OH/ mam Physics 123B, Winter 2009, Version b Exam 1, page 3 ...
View Full Document

Page1 / 3

Ex1Bb - Name Student ID Number last first 123 Section B...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online