2004 AP Physics C Elec

# 2004 AP Physics C Elec - S Questions 40-41 36 Three 1/2 F...

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S 36. Three 1/2 μF capacitors are connected in series as shown in the diagram above. The capacitance of the combination is (A) 0.1 μF (B) 1 μF (C) 2/3 μF (D) ½ μF (E) 1/6 μF 37. A hair dryer is rated as 1200 W, 120 V. Its effective internal resistance is (A) 0.1 Ω (B) 10 Ω (C) 12Ω (D) 120 Ω (E) 1440 Ω 38. A point charge +Q is inside an uncharged conducting spherical shell that in turn is near several isolated point charges, as shown above. The electric field at point P inside the shell depends on the magnitude of (A) Q only (B) the charge distribution on the sphere only (C) Q and the charge distribution on the sphere (D) all of the point charges (E) all of the point charges and the charge distribution on the sphere 39. In a certain region, the electric field along the xaxis is given by E = ax + b, where a = 40 V/m 2 and b = 4 V/m. The potential difference between the origin and x = 0.5 m is (A) 36 V (B) 7 V (C) 3 V (D) 10 V (E) 16 V Questions 40-41 A particle of charge +e and mass m moves with speed v perpendicular to a uniform magnetic field B directed into the page. The path of the particle is a circle of radius r , as shown above. 40. Which of the following correctly gives the direction of motion and the equation relating v and r ? Dir ection Equation (A) Clockwise eBr = mv (B) Clockwise eBr = mv 2 (C) Counterclockwise eBr = mv (D) Counterclockwise eBr = mv 2 (E) Counterclockwise eBr 2 = mv 2 41. The period of revolution of the particle is (A) mr/eB (B) (C) 2πm/eB (D) (E) 42. A 20 μF parallelplate capacitor is fully charged to 30 V. The energy stored in the capacitor is most nearly (A) 9 x 10 3 J (B) 9 x 10 -3 J (C) 6 x 10 4 J (D) 2 x 10 -4 J (E) 2 x 10 7 J 43. A potential difference V is maintained between two large, parallel conducting plates. An electron starts from rest on the surface of one plate and accelerates toward the other. Its speed as it reaches the second plate is proportional to (A) 1/V (B) (C) (D) V (E) V 2

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44. A wire of radius R has a current I uniformly distributed across its crosssectional area. Ampere's law is used with a concentric circular path of radius r, with r < R, to calculate the magnitude of the magnetic field B at a distance r from the center of the wire. Which of the following equations results from a correct application of Ampere's law to this situation? (A) B(2πr) = μ 0 I (B) B(2πr) = μ 0 I(r 2 /R 2 ) (C) B(2πr) = 0 (D) B(2πR) = μ 0 I (E) B(2πR) = μ 0 I(r 2 /R 2 ) Questions 4546 Particles of charge Q and 4Q are located on the xaxis as shown in the figure above. Assume the particles are isolated from all other charges. 45. Which of the following describes the direction
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2004 AP Physics C Elec - S Questions 40-41 36 Three 1/2 F...

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