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Final Exam: Electric and Magnetic Interactions - Spring 2007 | PHYS 27200, Exams of Physics

Material Type: Exam; Professor: Muzikar; Class: Electric And Magnetic Interactions; Subject: PHYS-Physics; University: Purdue University - Main Campus; Term: Spring 2007;

Typology: Exams

Pre 2010

Uploaded on 07/30/2009

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PHYS 272 Spring 2007
Friday, May 4
Final Exam
There are two parts to the final exam, this machine-graded test and a separate test that
you turn in to be graded by hand.
Machine Answer Sheet:
Using a pencil, fill in Last Name, First Name, & Middle Initial, plus your 10-digit Purdue
University ID number. Enter Instructor (Haugan), Course (PHYS 272), Date (05/04/07),
and Test (4). You must include your Signature.
Hand-Graded Sheet:
Enter your Name, Signature, PUID, and circle your Recitation Section.
When finished with both parts, bring them to the front of the classroom, show your
Purdue ID card to the Instructor, and turn in the machine-graded answer sheet and the
hand-graded answer sheet at the same time. These two parts together are worth 200
points total. Your grades will appear in the CHIP grade book in a few days.
Problems 1 through 4 involve a proton and an electron at time t. At that time the proton
is located at point A with position vector
rA=< 0,2 ×1010 , 0 >
m and the electron is
located at point B with position vector
rB=< 0,1×1010 , 0 >
m. Their velocities at time t
are
vp=< 3×106,0, 0 >
m/sec and
ve=< 1×106,0,1 ×106>
m/sec.
Problem 1. [8 points] Which of the following is the vector
rBA
that at time t points from
the position of the proton to the position of the electron?
1.
rBA =1×1010
m
2.
m
3.
rBA =< 0,3 ×1010 ,0 >
m
4.
rBA =< 0,1×1010 ,0 >
m
5.
rBA =< 0,1×1010 , 0 >
m
6.
rBA =< 0,3 ×1010 ,0 >
m
7.
rBA =< 3×106,1×1010, 0 >
m
8.
rBA =< 0,0,6×104>
m
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PHYS 272 Spring 2007 Friday, May 4 Final Exam There are two parts to the final exam, this machine-graded test and a separate test that you turn in to be graded by hand. Machine Answer Sheet: Using a pencil, fill in Last Name, First Name, & Middle Initial, plus your 10-digit Purdue University ID number. Enter Instructor (Haugan), Course (PHYS 272), Date (05/04/07), and Test (4). You must include your Signature. Hand-Graded Sheet: Enter your Name, Signature, PUID, and circle your Recitation Section. When finished with both parts, bring them to the front of the classroom, show your Purdue ID card to the Instructor, and turn in the machine-graded answer sheet and the hand-graded answer sheet at the same time. These two parts together are worth 200 points total. Your grades will appear in the CHIP grade book in a few days. Problems 1 through 4 involve a proton and an electron at time t. At that time the proton is located at point A with position vector

rA =< 0 , 2 × 10 − 10 , 0 > m and the electron is located at point B with position vector

rB =< 0 ,1 × 10 − 10 , 0 > m. Their velocities at time t are

vp =< − 3 × 10 6 , 0 , 0 > m/sec and

ve =< 1 × 10 6 , 0 ,1 × 10 − 6

m/sec. Problem 1. [8 points] Which of the following is the vector

rBA that at time t points from the position of the proton to the position of the electron?

rBA = 1 × 10 −^10 m

rBA = − 1 × 10 −^10 m

rBA =< 0 , 3 × 10 −^10 , 0 > m

rBA =< 0 ,− 1 × 10 −^10 , 0 > m

rBA =< 0 ,1 × 10 −^10 , 0 > m

rBA =< 0 , 3 × 10 −^10 , 0 > m

rBA =< 3 × 10 −^6 ,1 × 10 −^10 , 0 > m

rBA =< 0 , 0 ,− 6 × 10 −^4 > m

Problem 2. [8 points] Which of the following is an estimate of the electric field due to the proton at the location of the electron at time t?

  1. 1.4 × 1011 V/m
  2. −1.6 × 1010 N/C
  3. < 1.6 × 1010 ,0,0> N/C
  4. < −1.4 × 1011 ,0,0>N/C
  5. <0, −1.4 × 1011 ,0>V/m
  6. <0, 1.4 × 1011 ,0>V/m
  7. <0,0, 1.6 × 1010 >N/C Problem 3. [8 points] Which of the following is an estimate of the magnetic field due to the proton at the location of the electron at time t?
  8. 4.8T
  9. 0.53 T
  10. <0,0,4.8> T
  11. <0,0,-0.53> T
  12. <0,0.53,0> T
  13. <0.-4.8,0> T
  14. <0,4.8,0> T Problem 4. [8 points] Which of the following is an estimate of the magnetic force acting on the electron at time t?
  15. 7.6 × 10 − 11 N
  16. <0, 1.1 × 10 − 12 ,0> N
  17. <0, - 1.1 × 10 − 12 ,0> N
  18. <0,0, (^) 7.6 × 10 −^11 > N
  19. <0, −7.6 × 10 − 13 ,0> N
  20. <0, 7.6 × 10 − 13 ,0> N
  21. <0,0, −7.6 × 10 − 13

N

Problems 7 through 9 involve the solenoid and conducting ring shown in the figure below. The solenoid has a radius of 2 cm. The conducting ring has a radius of 10 cm. The magnitude of the magnetic field is 0.5 T inside the solenoid and approximately zero outside the solenoid. Arrows indicate the directions of the magnetic field and of the current flowing in the solenoid. Problem 7. [8 points] What is the magnetic flux through the large conducting ring?

  1. 0 T m^2
  2. (^) 6.3 × 10 −^4 T m^2
  3. 6.3 × 10 −^2 T m^2
  4. 1.6 × 10 −^2 T m^2
  5. 3.14 × 10 −^2 T m^2 Problem 8 [8 points] By adjusting the power supply connected to the solenoid you double the current flowing through the solenoid in 0.1 seconds. Estimate the emf around the large conducting ring while the current is changing.
  6. 0 V
  7. 0.16 V
  8. 1.6 × 10 −^3 V
  9. 6.3 × 10 −^5 V
  10. 6.3 × 10 −^3 V
  11. 0.314 V Problem 9 [8 points] In what direction does current flow in the large conducting ring while the current in the solenoid is increasing?
  12. No current flows.
  1. Current flows around the ring in the same direction as current flows around the solenoid.
  2. Current flows around the ring in the direction opposite current flow around the solenoid. Problems 10 through 12 deal with a proton that is accelerated in the direction shown below. Problem 10. [8 points] Radiation emitted by the accelerated proton arrives at location S some time later. In what direction is it traveling as it passes S? Problem 11. [8 points] For location S, what is the direction of

a ⊥ for the proton? Problem 12. [8 points] When radiation emitted by the accelerated proton at the reaches location P the magnitude of the radiative electric field measured there is

  1. greater than the magnitude of the corresponding radiative field measured at S.

Problem 15. [8 points] The figure below shows a negative point charge and a neutral block of plastic. Is the magnitude of the electric field at location A

  1. greater than
  2. equal to
  3. less than than it would be if the plastic block was moved far away from the charge and from A, or is it
  4. exactly zero?