2008FinalExam-04-22-08

# 2008FinalExam-04-22-08 - Department of Physics Lehigh...

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1 Department of Physics, Lehigh University Physics 21- Introductory Physics II Spring 2008 Final Exam May 1, 2008 Closed Note 4:00 PM-7:00 PM Student's Name ______________________ Recitation Section Number _____________ Recitation Leader's Name ______________ The test is a multiple-choice examination. First, check to be sure that you have a fourteen-page examination, including the cover sheet and the equation sheet. Please answer each question by circling the answer(s) that you find appropriate from the panel of choices available within each question space. Points summary Part I Part II Part III Total 1. ________(16) 5. ______(16) 9. ______(20) 2. ________(16) 6. ______(16) 10. ______(16) 3. ________(16) 7. ______(16) 11. ______(16) 4. ________(16) 8. ______(16) 12. ______(20) Sub-Total __________(64) ________(64) ________(72) _______(200)

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2 Part I 1. (16 points) The arrangement of five identical charges on a square lattice of side a is shown in the figure: q 1 =q 2 =q 3 =q 4 =q 5 =q . A. Find the electric potential at point P caused by the combination of q 1 and q 3 . i) q 4  o 1 2 a 2 ; ii) q 4 o 2 a ; iii) q 4 o 1 a ; iv) q 4 o 1 5 a 5 ; or v) q 4 o 3 2 a B. Find the electric potential at point P caused by the combination of q 2 and q 3 . i) q 4 o 1 2 a 2 ; ii) q 4 o 2 a ; iii) q 4 o 1 a ; iv) q 4 o 1 5 a 5 ; or v) q 4 o 3 2 a C. Find the electric potential at point P caused by the combination of q 1 and q 5 . i) q 4 o 1 2 a 2 ; ii) q 4 o 2 a ; iii) q 4 o 1 a ; iv) q 4 o 1 5 a 5 ; or v) q 4 o 3 2 a D. Find the electric potential caused by the combination of q 4 and q 5 . i) q 4 o 1 2 a 2 ; ii) q 4 o 2 a ; iii) q 4 o 1 a ; iv) q 4 o 1 5 a 5 ; or v) q 4 o 3 2 a
3 mf r 1 R 2 R S 3 R 2. (16 points) In the circuit to the right, three identical resistors ( R 1 =R 2 =R 3 =R ) are connected to a battery as shown. The emf of the battery is 12.0 V and the resistances ( R ) of the large resistors are each 5 50 . . The internal resistance of the battery ( r ) is 05 . . A. Before the switch S is closed, what is the current through the battery? )0 iA ; ) 1.043 ii A ; ) 30.545 iii A ; ) 1.091 iv A ; or ) 0.706 vA B. When the switch S is closed , what is the terminal voltage of the battery (i.e., the potential drop between and )? ) 12 iV ; ) 11.47 ii V ; ) 11.31 iii V ; ) 11.647 iv V ; or ) 11.806 vV C. When the switch S is open , what is the terminal voltage of the battery (i.e., the potential drop between and )? ) 11.806 ; ) 11.47 ii V ; ) 11.647 iii V ; ) 12 iv V ; or ) 11.31 iv V In the circuit to the right, the 18 V-battery is charging the 12 V-battery. The 18 V-battery has an internal resistance of 1 and the 12 V battery has an internal resistance of 2 . The large resistor R has a resistance of 66 . .

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2008FinalExam-04-22-08 - Department of Physics Lehigh...

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