浙江大学2004-2005学年冬季学期 Physics（）课程期末考试试卷开课学院：理学院 考试形式：闭卷，允许带非存储计算器、纸质词典入场考试时间:2005年 1月21日 所需时间120分钟姓名_专业 学号 组号 任课教师 题 序一二三四五六七八总分得 分评卷人Planck constant h=6.6310-34Js Charge of an electron e=1.610-19CPermittivity constant e0=8.8510-12C2/(Nm2) Electronic volt 1eV=1.6 10-19JPermeability constant m0=4p10-7H/m Mass of an electron me=9.11 10-31kg . Multiple choices (there is one correct answer only):1. The electric charge on a conductor isA. Uniformly distributed throughout the volume.B. Confined to the surface and is uniformly distributed.C. Mostly on the outer surface, but is not uniformly distributed.D. Entirely on the surface and is distributed according to the shape of the object.E. Distributed throughout the volume of the object and distributed according to the objects shape.2.* You are given a closed circuit with radii a and b, as shown in the Fig. , carrying current i. The magnetic dipole moment of the circuit is: A. .B.C. .D. .3. A parallel plate capacitor is attached to a battery that supplies a constant potential difference. While the battery is still attached, the parallel plates are separated a little more. Which statement describes what happens?. A. The electric field increases and the charge on the plates increases.B. The electric field remains constant and the charge on the plates increases.C. The electric field remains constant and the charge on the plates decreases.D. Both the electric field and the charge on the plate decreases.4. 4. A wire carries current as shown in the Fig. Point charge 1 and 4 move in the directions indicated. If the magnetic forces on charges 1 and 4 are equal and their velocities are equal, A. The charges have the same sign and .B. B. The charges have opposite sign and .C. The charges have the same sign and .D. The charges have opposite sign and .5. 5. Displacement current exists in the region between the plates of a parallel plate capacitor if:A. the capacitor leaks(泄漏) charge across the platesB. the capacitor is being dischargedC. the capacitor is fully chargedD. the capacitor is fully dischargedE. none of the above are true6. The intensity pattern as shown in Fig. is due to.A. two slitsB. a single slitC. a gratingD. a circular apertureE. none of above7. The Fermi energy of copper at 0K representsA.the average energy of the electrons.B. the energy necessary to remove an electron from the surface.C.the maximum energy of any electron.D. the minimum energy of any electron.8. How many of Oxygens eight electrons are found in the p state?A. 0B. 2C. 4D. 6E. 89. In the Compton effect, a photon of wavelength and frequency f is scattered from an electron, initially at rest. In this process, A. the electron gains energy from the photon so that the scattered photons wavelength is less than . B. the electron gives energy to the scattered photon so that the photons frequency is greater than f.C. momentum is not conserved, but energy is conserved.D. the photon loses energy so that the scattered photon has a frequency less than f.10. Specify which of the following types of materials might satisfy this description: a filled valence band, an empty conduction band, an energy gap of 0.5eV.A. ConductorB. InsulatorC. SemiconductorD. None of above.Calculation problems (present the necessary equations in solution):1.* On a thin rod of length L lying along the x axis with one end at the origin (x=0), as in Figure, there is distributed a charge per unit length given by =kr, where k is a constant and r is the distance from the origin. (a) Taking the electrostatic potential at infinite to be zero, find V at the point P on the y axis. (b) Determine the vertical component, Ey, of the electric field at P from the result of part (a). (c) Why cannot Ex, the horizontal component of the electric field at P, be found using the result of part (a)? (d) At what distance from the rod along the y axis is the potential equal to one-half the value at the left end of the rod?2.*A rectangular loop of wire with length a , width b, and resistance R is placed near an infinite long wire carrying current i, as shown in Figure. The distance from the long wire to the loop is D. Find (a) the magnitude of the magnetic flux through the loop. (b) the current in the loop as it moves away from the long wire with speed v.3. A film of soapy water in air is held vertically and viewed in reflected light. The film has index of refraction n=1.36.(a) Explain why the film appears black at the top. (b) The light reflected perpendicular to the film at a certain point is missing the wavele