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11/14/12 Questions For Physics 2A Questions For Physics 2A This File Contains some American Questions for Physics 2A Topics Are: Electric Fields Flux and Gauss Law Electric Potentials Capacitance Electric Field problem 1 The diagrams below depict four different charge distributions. The charged particles are all the same distance from the origin. The electric Field at the origin: A. B. C. D. E. is greatest for situation 1 is greatest for situation 3 is zero for situation 4 is downward for situation 1 is downward for situation 3 problem 2 Positive charge +Q is uniformly distributed on the upper half of a semicircular rod and negative charge -Q is uniformly distributed on the lower half. What is the direction of the electric Field at point P, the center of the semicircle? A. B. C. D. ← → ↑ ↓ problem 3 Two point particles, with charges of q1 and q2, are placed a distance r apart.The electric Field is zero at a point P between the particles on the line segment connecting them. We conclude that: A. q1 and q2 musthavethesamemagnitudeandsign B. P must be midway between the particles C. q1 and q2 must have the same sign but may have different magnitudes physweb.bgu.ac.il/COURSES/Physics2A/Physics2_ComBioMed/physics2Aquestions/questions.html 1/5 11/14/12 Questions For Physics 2A D. q1 and q2 must have equal magnitudes and opposite signs E. q1 and q2 must have opposite signs and may have different magnitudes Flux and Gauss Law problem 4 The flux of the electric Field A. B. C. D. E. through a portion of the yz plane in 32 34 42 48 60 problem 5 A particle with charge 5.0 μC is placed at the corner of a cube. The total electric flux in A. B. C. D. E. through all sides of the cube is: 0 71000 94000 140000 560000 problem 6 Which of the following graphs represents the magnitude of the electric Field as a function of the distance from the center of a solid charged conducting sphere of radius R? problem 7 Charge Q is distributed uniformly throughout an insulating sphere of radius R. The magnitude of the electric field at a point r=R/2 from the center is A. B. C. D. physweb.bgu.ac.il/COURSES/Physics2A/Physics2_ComBioMed/physics2Aquestions/questions.html 2/5 11/14/12 Questions For Physics 2A E. none of the above Electric Potential problem 8 A particle with mass m and charge -q is projected with speed v0 into the region between two parallel plates as shown. The potential difference between the two plates is V and their separation is d. The change in kinetic energy of the particle as it traverses this region is: A. B. C. D. E. none of the above problem 9 An electron goes from one equipotential surface to another along one of the four paths shown below. Rank the paths according to the work done by the electric field, from least to greatest A. B. C. D. E. 1,2,3,4 4,3,2,1 1,3, 4 and 2 same 4 and 2 same,3,1 4,3,1,2 problem 10 A total charge of 7X10^(-8) C is uniformly distributed throughout a non-conducting sphere with a radius of 5 cm. The electric potential at the surface, relative to the potential far away, is about: A. B. C. D. E. -1.3X10^4 1.3X10^4 7X10^5 -6.5X10^4 0 physweb.bgu.ac.il/COURSES/Physics2A/Physics2_ComBioMed/physics2Aquestions/questions.html 3/5 11/14/12 Questions For Physics 2A problem 11 If the electric field is in the positive x direction and has a magnitude given by E = Cx2, where C is a constant, then the electric potential is given by V =: A. B. C. D. E. problem 12 Three possible configurations for an electron e and a proton p are shown below. Take the zero of potential to be at infinity and rank the three configurations according to the potential at S, from most negative to most positive. A. B. C. D. E. 1, 2, 3 3, 2, 1 2, 3, 1 1 and 2 tie, then 3 1 and 3 tie, then 2 Capacitance problem 13 The capacitance of a parallel-plate capacitor can be increased by: A. B. C. D. E. increasing the charge decreasing the charge increasing the plate separation decreasing the plate separation decreasing the plate area problem 14 Each of the four capacitors shown is 500 μF. The voltmeter reads 1000V. The magnitude of the charge, in coulombs, on each capacitor plate is: physweb.bgu.ac.il/COURSES/Physics2A/Physics2_ComBioMed/physics2Aquestions/questions.html 4/5 11/14/12 Questions For Physics 2A A. B. C. D. E. 0.2 0.5 20 50 none of the above problem 15 A 2 μF and a μF capacitor are connected in series and charged by a battery. They store energies P and Q, respectively. When disconnected and charged separately using the same battery, they store energies R and S, respectively. Then: A. B. C. D. E. R>P>S>Q P>Q>R>S R>P>Q>S P>R>S>Q R>S>Q>P Solutions 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. C D C D B E D C D B D D D B E physweb.bgu.ac.il/COURSES/Physics2A/Physics2_ComBioMed/physics2Aquestions/questions.html 5/5