※ [本文转录自 NTU-Exam 看板] 作者: Chieng9086 (郑公) 看板: NTU-Exam 标题: [试题] 97下 黄晖理 普通物理甲 期中考 时间: Fri Apr 24 22:26:39 2009 课程名称︰普通物理 课程性质︰必修 课程教师︰黄晖理 开课学院：理学院 开课系所︰生机系 考试日期（年月日）︰98.04.16 考试时限（分钟）：120 min 是否需发放奖励金：yes （如未明确表示，则不予发放） 试题 : (一) 简答题 30分 1.What does the "A microscopic view of ohm's law " mean ? 2.Explain that how to measure the mass of proton ? 3.Give a brief description about "Hall effect" ? 4.How J.J Thomson reached the conclusion that he has discovered the "electron" ? 5.Explain what means by "magnetic bottle" or "magnetic mirror effect". 6.A closed path line integral of E˙dl is zero if the charge involved is at rest. On the other hand,it is nonzero if the charge is in motion. Explain why is that. (二) 计算题 70分 1.A solid sphere of radius R has a uniform charge density ρ and total charge Q.What is the total electric potential energy of the charge sphere ? 10分 2.(a) Determine E at points both inside and outside a uniform spherical distr- ibution of radius R and charge Q. 5分 (b) Determine the potential V at the spherical center and surface. 10分 3.(a) Determine the time constant of the circuit. 5分 (b) Determine Q1 and Q2 at t=∞. 5分 (c) Determine the energy dissipated at R when the circuit has arrived steady state. 5分 4.A metal bar of mass m,lenth l,and resistence R slides down a pair of fricti- onless rail of negligible resistence inclined an angle θ to the horizontal. A uniform magnetic field is directed vertically upward. (a) What is the current induced in the rod when the rod is at terminal speed (Assume that the railshave no r-esistence) (b) What is the terminal speed of the rod ? (c) Show that the rate at which thermal energy is being gererated in the rod is equal to the rate at which the rod is losing gravitational potential energy . 5.The wire in the figure carries a current i. (a) Find the magnectic field at center C (b) If the wire is placed in the uniform magnectic field B pointing out of paper. Calculate the force acting on the wire. --

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