※ [本文转录自 NTU-Exam 看板] 作者: yaujack (大头) 看板: NTU-Exam 标题: [试题] 94下 普通物理-苏得润 时间: Thu Apr 20 16:08:40 2006 课程名称︰ 普通物理甲下 课程性质︰ 课程教师︰ 苏得润 开课系所︰ 机械系 考试时间︰ 4/20 试题 : 1. (a) If there is a charge -Q is put on the top of an inclined plane with inclined angle θ, what will be the balance position x of a charged block with mass m and charge q from the top? (10%) (b-1) If the block is started from 2/x < x_1 < x from the top, what will be acceleration of the block slided along the plane if the plane is frictionless?　(5%) (b-2) what is the velocity when the block is passing through the point x? (10%) 2. Figure 23-17(不会画, 见Halliday Fundamental Physics, SampleProblem 23-6) shows portions of two large, parallel. nonconducting sheets. each with a fixed uniform charge on one side. The magnitudes of the surface charge densities are σ(+) = 6.8μC/m^2 for the positively charged sheet and σ(-) = 4.3μC/m^2 for the negatively charged sheet. Find the electric field E (a) to the left of the sheets. (b) between the sheets. and(c) to the right of the sheets. (25%) 3. A slab of copper of thickness b = 2.00mm is thrust into a parallel-plate capacitor of plate area A = 2.40cm^2 and plate separation d = 5.00mm, as shown in Fig. 25-65(见Halliday, Fundamental Physics, p681. 82题); the slab is exactly halfway between the plates. (a) What is the capacitance after the slab is introduced? (b) If a charge q = 3.40μC is maintained on the plates, what is the ratio the stroed energy before to that after the slab is inserted? (c) How much work is done on the slab as it is inserted? (d) Is the slab sucked in or must it be pushed in? 4. In Fig. 27-34.(见Halliday, Fundamental Physics, p727. 19题) R_1=100Ω. R_2 = 50Ω. and the ideal batteries have emfs ε_1 = 6.0V, ε_2 = 5.0V, and ε_3 = 4.0V. Find (a) the current in resistor 1, (b) the current in resistor 2, and (c) the potential difference between points a and b. --

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