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27题，约1740字。

　　北京师范大学附属实验中学
　　高二年级国际班物理会考样卷
　　班级            姓名             学号           
　　一．选择题：单项选择题。每小题4分，本题共100分。
　　D1. How many electrons have been removed from a positively charged electroscope if it has a net charge of 7.5×10-11 C?
　　A. 7.5×10-11 electrons     B. 2.1×10-9 electrons
　　C. 1.2×108 electrons      D. 4.7×108 electrons
　　A2. Two charged bodies exert a force of 86 N on each other. If they are moved so that they are six times farther apart, what is the new force that they will exert on each other?
　　A. 2.4 N   B.  86 N   C. 14 N    D. 5.2×102 N
　　A3. Charging a neutral body by touching it with a charged body is called charging by _______ .
　　A. conduction   B. grounding   C. induction    D. discharging
　　D4. A positive test charge of 8.7  C experiences a force of 8.1×10-6 N at an angle of 24˚N of E. What are the magnitude and direction of the electric field strength at the location of the test charge?
　　A. 7.0×10-8 N/C, 24˚N of E     B. 1.7×10-6 N/C, 24˚S of W
　　C. 1.1×10-3 N/C, 24˚W of S     D. 9.3×10-1 N/C, 24˚N of E
　　A5. Each free-charge carriers have a charge q and move with a speed v in a conductors of cross-sectional area A. Let n be the number of free charge carriers per unit volume. The current in the conductor is given by
　　A. I=nqvA   B. I=nqv/A   C. I=nqv    D.  I=nqv2A
　　B6. An electron is placed between the plates of the capacitor. What force is exertedon that electron?
　　A. 6.0×10-23N  B. 7.7×10-15 N  C. 1.2×10-15 N  D. 5.4 N
　　A7. A wire of radius 1mm and length 2m is made of platinum (resistivityρ=1×10-7Ω·m) . If a voltage of 9V is applied between the ends of the wire, what will be the resulting current?
　　A. 141 A   B. 280 A  C. 70 A   D.  360 A
　　A8. A rectangular loop of wire that carries a current I is placed in a uniform magnetic field, B. What torque does it experience?
　　A. Il1l2B     B. Il1B 
　　C. Il2B      D. Il1l2B/2
　　D9. For a charged particle moving in a circular trajectory, _______.
　　A. the magnetic force is parallel to the velocity and is directed toward the center of the circular path
　　B. the magnetic force may be perpendicular to the velocity and is directed away from the center of the circular path
　　C. the magnetic force always remains parallel to the velocity and is directed away from the center of the circular path
　　D. the magnetic force always remains perpendicular to the velocity and is directed toward the center of the circular path