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# ap04_mc_em - Physics C Electricity and Magnetism PHYSICSC...

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Physics C: Electricity and Magnetism PHYSICS C Section I, ELECTRICITY AND MAGNETISM Tlme-45 minutes 35 Questions Directions: Each of the questions or incomplete statements below is followed by frve suggested answers ot completions. Select the one that is best in each case and then fill in the corresponding oval on the answer sheet. t t l t t l t t l t t l I 36. Thrce * uF caDacitors arc connec0ed in series as L ' shown in the diagrarn above. The capacitance of the combination is (A) :uF ' ' z ' (B) I pF ) (C) +uF - J ' (D) +uF ' ' z ' I (E) +uF ' - o ' 37. A hair dryer is rated as 1200 W, 120 V. Its effective intemal resistance is (A) 0.1 o (B) l0 o (c) 12 o (D) 120 o (E) 1440 O .42 .ql .q3 ot thl. 38. A point charge +p is inside an uncharged conducting spherical shell that in tum is near several isolated point charges, as shown above. The electric field at point P inside the shell depends on the magnitude oI (A) O only (B) the charge distribution on the sphere only (C) Q and the charge distribution on the sphere @) all of the point charges @) all of the point charges and the charge distribution on the sphere 39, In a certain region, the electric field along the r-axis is given by E=ax+b.where a=4OYhrP and D=4Vlm. The potential diffeience between the origin and .r=0.5m is (A) -36 V (B) -7 v (c) -3 v (D) 10V (E) 16 V 734 GO ON TO THE NEXT PAGE.

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Physics C: Electricity and Magnetism Questions 40'41 X X X X X X A Darticle of charge +e and mass ln moves with r*"i*r" o"""taictilar to a uniform magnetic field B alr""t"a ioto itt" 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 o and r? X X 42. A2O pF parallel-plate capacitor is fully charged to 30 V. The energy stored in the capacitor is most nearlY (A) 9x103J (B) 9x10-3J (C) 6x 10-4J (D) 2x10-4J (E) 2x 10-7 J 43. A ootential difference V is maintained between '-' i*i1**". p*ullel conducting plates' An electron .tu.t. fon te.t on the surface of one plate and acceierates toward the other' Its speed as it reaches the second plate is propodional to ltv ruJV X X A B v v2 (A) (B) (c) (D) (E) Direction (A) Clockwise (B) Clockwise (C) Counterclockwise (D) Counterclockwise (E) Couirterclockwise 41. The period of revolution of the particle is (A) (B) (c) (D) (E) iflcoprylng or tcu.c ol ol thl. prgp l. lll gd' 44. A wire of radius R has a current I uniformly distributed across its cross-sectional area' l*p"tt;. tu* it used with a concennic circular oath'of radius r, with r < R, to calculate the 'maenitude of the magnetic field B at a distance froir the center of the wite' Which of the following equations results from a correct "ppril"ai" 6r n perc's law to this situation?
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ap04_mc_em - Physics C Electricity and Magnetism PHYSICSC...

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