AP Physics C: Electricity and Magnetism · Full practice exam 2012

38 questions, each with its course unit and the official scoring guidelines.

Official paper (PDF) · Full examAll AP Physics C: E&M papers→

Question Section I · 4

Multiple choice
Question Section I · 4 — Questions 2-4 Three particles having charges of +q, +Q, and -Q are placed at the corners of an equilateral triangle of side a, as shown above. 4. The potential energy of the particle with charge +q due to the other two…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 5

Multiple choice
Question Section I · 5 — 5. All the following statements about an isolated, solid charged conductor are correct EXCEPT: (A) All parts of the conductor are at the same potential. (B) All excess charge resides on the outer surface. (C) The net…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 6

Multiple choice
Question Section I · 6 — Questions 6-8 Two long, straight, parallel wires are held fixed, as shown above. A voltage is applied to wire X, creating a current X I to the right, and the wire experiences a magnetic force of magnitude B F toward…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

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Question Section I · 7

Multiple choice
Question Section I · 7 — Questions 6-8 Two long, straight, parallel wires are held fixed, as shown above. A voltage is applied to wire X, creating a current X I to the right, and the wire experiences a magnetic force of magnitude B F toward…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 8

Multiple choice
Question Section I · 8 — Questions 6-8 Two long, straight, parallel wires are held fixed, as shown above. A voltage is applied to wire X, creating a current X I to the right, and the wire experiences a magnetic force of magnitude B F toward…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 9

Multiple choice
Question Section I · 9 — 9. A proton moving to the right at constant speed u enters a region containing uniform magnetic and electric fields and continues to move in a straight line. The magnetic field B is directed toward the top of the page,…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 10

Multiple choice
Question Section I · 10 — Questions 10-11 The plate areas and separations for three capacitors are shown in the diagram above. The space between the plates in each capacitor is filled with air. 10. Suppose all three capacitors have charge +Q on…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 11

Multiple choice
Question Section I · 11 — Questions 10-11 11. Suppose all three capacitors are connected in parallel with a 9 V battery. Which of the following is true of the electric field between the plates? (A) It is greatest for I. (B) It is greatest for…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 12

Multiple choice
Question Section I · 12 — 12. The electric potential along an x-axis is given by the expression V = ax - bx2, where a and b are constants. At what point on the x-axis is the electric field zero? (A) x = 0 (B) x = a/2b (C) x = a/b (D) x = 3a/2b…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

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Question Section I · 13

Multiple choice
Question Section I · 13 — 13. A uniform magnetic field B of magnitude 1.2 T passes through a rectangular loop of wire, which measures 0.10 m by 0.20 m. The field is oriented 30° with respect to the plane of the loop, as shown above. What is the…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 14

Multiple choice
Question Section I · 14 — 14. A metal sphere with radius 1r has a total electric charge of magnitude q. An uncharged metal sphere with radius 2r (with 1 2 r r > ) is then connected by a wire to the first sphere, as illustrated above. The…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 16

Multiple choice
Question Section I · 16 — 16. Three resistors having resistances of 3 W , 6 W , and 9 W , respectively, are connected in parallel with a 10 V battery. True statements about the circuit include which of the following? I. The current in the 9 W…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 17

Multiple choice
Question Section I · 17 — 17. When two resistors having resistances 1 R and 2 R are connected in parallel, the equivalent resistance of the combination is 10 W . Which of the following statements about the resistances is true? (A) Both 1 R and 2…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

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Question Section I · 20

Multiple choice
Question Section I · 20 — 20. A uniform electric field E exists between the two large, oppositely charged plates shown above. If the distance between the plates is increased without changing the charges on the plates, which of the following…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 21

Multiple choice
Question Section I · 21 — 21. When two identical resistors are connected in series to a battery, the total power dissipated is P. When the same two resistors are connected in parallel to the same battery, the total power dissipated is (A) 1 4 P…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 22

Multiple choice
Question Section I · 22 — 22. A positively charged particle in a uniform magnetic field is moving in a circular path of radius r perpendicular to the field. How much work does the magnetic force F do on the charge for half a revolution? (A) 2 r…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 23

Multiple choice
Question Section I · 23 — Questions 23-25 The diagram above shows a cross section of equipotential lines produced by a charge distribution. Points A, B, C, and D lie in the plane of the page. 23. For which two points can a negatively charged…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 24

Multiple choice
Question Section I · 24 — Questions 23-25 The diagram above shows a cross section of equipotential lines produced by a charge distribution. Points A, B, C, and D lie in the plane of the page. 24. A positively charged particle is moved by an…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

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Question Section I · 25

Multiple choice
Question Section I · 25 — Questions 23-25 The diagram above shows a cross section of equipotential lines produced by a charge distribution. Points A, B, C, and D lie in the plane of the page. 25. The electric potential shown in the diagram could…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 26

Multiple choice
Question Section I · 26 — 26. A magnetic field perpendicular to the plane of a wire loop is uniform in space but changes with time t in the region of the loop. If the induced emf in the loop increases linearly with time t, then the magnitude of…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 27

Multiple choice
Question Section I · 27 — 27. A loop of wire carrying a steady current I is initially at rest perpendicular to a uniform magnetic field of magnitude B, as shown above. The loop is then rotated about a diameter at a constant rate. The torque on…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 28

Multiple choice
Question Section I · 28 — 28. The solid conducting sphere of radius R shown above has a charge Q + distributed uniformly on its surface. The potential at the center of the solid sphere is (A) 0 1 4 Q R p +  (B) 0 1 4 Q R p -  (C) 2 0 1 4 Q R p…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 29

Multiple choice
Question Section I · 29 — Questions 29-31 A circuit consists of a resistor R, an inductor L, and an open switch S connected in series with a battery. The switch is then closed at time t = 0. 29. If the current in the circuit is I at time t, what…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 30

Multiple choice
Question Section I · 30 — Questions 29-31 A circuit consists of a resistor R, an inductor L, and an open switch S connected in series with a battery. The switch is then closed at time t = 0. 30. Which of the following quantities could be…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

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Question Section I · 31

Multiple choice
Question Section I · 31 — Questions 29-31 A circuit consists of a resistor R, an inductor L, and an open switch S connected in series with a battery. The switch is then closed at time t = 0. 31. The change in current when the switch is closed is…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 32

Multiple choice
Question Section I · 32 — 32. A capacitor of capacitance C1 is charged and then connected to another initially uncharged capacitor of capacitance C2 = 2C1, as shown above, with the switch S in the open position. When S is closed and the system…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 33

Multiple choice
Question Section I · 33 — 33. An air-gap capacitor originally has capacitance C. If a thin sheet of metal is placed halfway between the plates of the capacitor without touching either plate, as shown above, the effective capacitance is (A) 4C…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 34

Multiple choice
Question Section I · 34 — 34. The figure above shows the paths of five particles as they pass through the region inside the box that contains a uniform magnetic field B directed out of the page. Which particle has a positive charge? (A) A (B) B…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section I · 35

Multiple choice
Question Section I · 35 — 35. A long, straight wire of radius a carries a current I out of the page, which is uniformly distributed over the cross section of the wire. The value of Ú Bi v  d , the line integral of the magnetic field B around…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

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Question Section II · 2

Open answer
Question Section II · 2 — E&M. 2. A physics student wishes to measure the resistivity of slightly conductive paper that has a thickness of 4 1.0 10 m - ¥ . The student cuts a sheet of the conductive paper into strips of width 0.02 m and varying…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

Question Section II · 3

Open answer
Question Section II · 3 — E&M. 3. A closed loop is made of a U-shaped metal wire of negligible resistance and a movable metal crossbar of resistance R. The crossbar has mass m and length L. It is initially located a distance 0 h from the other…

Source: College Board — AP Physics C: Electricity and Magnetism, Full practice exam, 2012

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