AP Physics 2 Electrostatics Test (20 Multiple Choice) 1. The electron volt is a measure of (A) charge (B) energy (C) impulse (D) momentum (E) velocity 2. A solid conducting sphere is given a positive charge Q. How is the charge Q distributed in or on the sphere? (A) It is concentrated at the center of the sphere. (B) It is uniformly distributed throughout the sphere. (C) Its density decreases radially outward from the center. (D) Its density increases radially outward from the center. (E) It is uniformly distributed on the surface of the sphere only. 3. A parallel–plate capacitor is charged by connection to a battery. If the battery is disconnected and the separation between the plates is increased, what will happen to the charge on the capacitor and the voltage across it? (A) Both remain fixed. (B) Both increase. (C) Both decrease. (D) The charge increases and the voltage decreases. (E) The charge remains fixed and the voltage increases. Questions 4 – 5 A point P is 0.50 meter from a point charge of 5.0 × 10^–8 coulomb. 4. The intensity of the electric field at point P is most nearly (A) 2.5 × 10^–8 N/C (B) 2.5 × 10^1 N/C (C) 9.0 × 10^2 N/C (D) 1.8 × 10^3 N/C (E) 7.5 × 10^8 N/C 5. The electric potential at point P is most nearly (A) 2.5 × l0^–8 V (B) 2.5 × 10^1 V (C) 9.0 × 10^2 V (D) 1.8 × 10^3 V (E) 7.5 × 10^3
V 6. One joule of work is needed to move one coulomb of charge from one point to another with no change in velocity. Which of the following is true between the two points? (A) The resistance is one ohm. (B) The current is one ampere. (C) The potential difference is one volt. (D) The electric field strength is one newton per coulomb. (E) The electric field strength is one joule per electron. 2 7. Two charged particles, each with a charge of +q, are located along the x–axis at x = 2 and x = 4, as shown above. Which of the following shows the graph of the magnitude of the electric field along the x–axis from the origin to x = 6? 8. From the electric field vector at a point, one can determine which of the following?
- Fall '08
- Electric charge, one ampere, One newton, one joule, Ampere., 8 coulomb