S10P2BFinalA

# S10P2BFinalA - Physics 2B Spring 2010: Final Version A 1...

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Physics 2B Spring 2010: Final Version A 1 06.11.10 COMMENTS AND REMINDERS: _______________________________________________ Closed book. No work needs to be shown for multiple-choice questions. 1. A charge of +4.0 C is placed at the origin. A charge of 3.0 C is then placed at x = 1.0 m. A third charge of + 6.0 C is then placed at x = 10.0 m. What is the magnitude of the force on a proton placed at x = 4.0 m? a) 3.6 × 10 10 N . b) 1.7 × 10 8 N. c) 8.4 × 10 8 N. d) 1.2 × 10 10 N . e) 7.5 × 10 8 N. 2. A uniformly charged ring is 1.0 cm in radius. The electric field on the axis 2.0 cm from the center of the ring has magnitude of 2.2 MN/C and points toward the ring center. Find the ring charge a. - 97 nC b. - 12.2 nC c. - 116 nC d. - 137 nC e. - 218 nC 3. A closed surface contains the following point charges: 6 C, 4 C, –2 C, –4 C. The electric flux coming out of the surface is: a. 1.8 " 10 12 N # m 2 C . b. " 1.8 # 10 12 N \$ m 2 C . c. 4.5 " 10 11 N # m 2 C . d. " 4.5 # 10 11 N \$ m 2 C . e. 1.1 " 10 12 N # m 2 C .

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Physics 2B Spring 2010: Final Version A 2 06.11.10 4. Charges of +5.0 × 10 6 C each are located at three of the corners of a square that is 1.0 m on each side. A charge of – 7.5 × 10 6 C is located at the other corner. What is the electric potential ( i.e. voltage) at the center of the square due to these charges? a. 9.5 × 10 4 V. b. 6.7 × 10 4 V. c. 1.6 × 10 5 V. d. 3.2 × 10 4 V. e. 2.9 × 10 5 V. 5. A capacitor consists of conducting sphere of radius R 1 surrounded by a concentric conducting shell of radius R 2 . What is its capacitance? a. ε ο R 1 2 / R 2 b. ε ο R 1 . R 2 c. 4 π ε ο R 1 . R 2 /( R 1 - R 2 ) d. 4 π ε ο R 1 2 / R 2 e. ε ο ( R 1 - R 2 ) 6. A long, thin wire carries a uniform line charge density λ = -6.8 μ C/m. It is surrounded by a thick concentric cylindrical shell of inner radius 2.5 cm and outer radius 3.5 cm. What uniform charge density in shell will result in zero electric field outside of the shell?
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## This note was uploaded on 12/11/2011 for the course PHYS 2B 2b taught by Professor Hirsch during the Spring '10 term at UCSD.

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S10P2BFinalA - Physics 2B Spring 2010: Final Version A 1...

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