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Exam 3

Pringle. Obeidat. Parris. Waddill. Schulz. Hale. Welcome to the Physics 24 Exam!. With my chainsaw in my left hand, my right hand is free for the right hand rule!. Do you know your exam room?. Don’t forget to pick up your test preparation homework. Exam 3.

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Exam 3

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  1. Pringle Obeidat Parris Waddill Schulz Hale Welcome to the Physics 24 Exam! With my chainsaw in my left hand, my right hand is free for the right hand rule! Do you know your exam room? Don’t forget to pick up your test preparation homework. Exam 3 adapted from http://www.nearingzero.net (work022.jpg)

  2. Announcements • Pick up test preparation homework from the back of the lecture hall. • Updated course grades will hopefully be available by 3:00 pm, November 13. Grades spreadsheets will not be updated over the weekends after exams. • Snow showers in the forecast tonight. Not enough to cancel the exam. See class cancellation policy on page 4 here: http://campus.mst.edu/physics/courses/24/CourseInformation/physics_24_policies.pdf

  3. Physics 24 Test Room Assignments, Fall 2013: Instructor Sections Room Dr. Hagen J, M 125 Butler-Carlton Dr. Hale E, G 104 Physics Dr. Hor *B, D 120 Butler-Carlton Mr. Upshaw H, K, L G-3 Schrenk Dr. Vojta C, F 204 McNutt Dr. Waddill A G-3 Schrenk 4:30 & 5:30 Exams 202 Physics Special Needs Testing Center Exam is from 5:00-6:15 pm! Know the exam time! Find your room ahead of time! If at 5:00 on test day you are lost, go to 104 Physics and check the exam room schedule, then go to the appropriate room and take the exam there.

  4. Exam 3 Review The problems in this lecture are the standard “exam review lecture” problems and are not a guarantee of the exam content. Please Look at Prior Tests!

  5. Contents: Biot-Savart law magnetic field of moving charged particles Ampere’s Law motional emf electromagnetic waves

  6. P I A conductor consists of a circular loop of radius R and two long straight sections as shown. The straight sections are radial. The wire lies in the plane of the paper and carries current I. Determine the magnitude and direction of the magnetic field at the center of the loop (assume the gap in the loop is negligible).

  7. A long straight wire carries a current I. Near the wire is a square conducting loop that includes a battery and a switch, as shown in the diagram. (Assume the battery and switch are small enough that all sides of the square loop have the same effective length.) When the switch is closed, in what direction will the square loop accelerate? I + -

  8. A hollow cylindrical conducting tube of inner radius b and outer radius c carries a current I. A solid cylindrical conductor of radius a<b is coaxial with the tube and carries a current I in the same direction as the current in the tube. Calculate the magnitude of the magnetic field inside the cylindrical tube.

  9. A rectangular telescoping conducting loop is being pulled open. Its height is H and its length is increasing at a rate L=L0+t. The loop is in a uniform magnetic field as shown in the diagram. Calculate the magnitude and direction of the emf induced in the loop. H  B L

  10. A problem for you to think about. I am not going to work out the details! A long straight wire carries a current I. A conducting bar moves with speed v as shown. • What is the direction of the magnetic force on + charges in the bar? • Which end of the bar will be at a higher potential? • Find an expression for the electric field in the bar. • Could you use the Mr. Ed equation to calculate V across the bar? • If not, how would you calculate V? I v

  11. At what distance from a 100 W electromagnetic wave point source does Emax = 15.0 V/m? What is the average energy density of the electromagnetic wave at that point? 9.96x10-10 J/m3 5.16 m A 100 mW laser beam is perfectly reflected directly back on itself by a mirror. Calculate the force the laser beam exerts on the mirror. 6.67x10-10 N

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