[轉錄][試題] 普通物理學甲下王建萬老師

看板NTUBSE-B-94作者airdry (簡單過生活)時間18年前 (2006/06/26 00:08)推噓3(3推 0噓 0→)

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※ [本文轉錄自 airdry 信箱] 作者: michaelhsieh (這樣算失戀嗎...*_*) 看板: NTU-Exam 標題: [試題] 普通物理學甲下王建萬老師時間: Sat Jun 25 09:33:59 2005 課程名稱︰普通物理學甲下課程性質︰必修課程教師︰王建萬老師開課系所︰生工系考試時間︰6/24 10:20~12:10 試題 : 1.In Fig.1, R=14.0Ω, C=6.20F, and L=54.0mH, and the ideal battery has emf ε=34.0V. The switch is kept in position a for a long time and then thrown to position b. What are (a) frequency and (b) current amplitude of the resulting oscillations? (10%) 2.A parallel-plate capacitor with circular plates of radius R is being charged as in Fig.2. (a) Derive an expression for the magnetic field at radius r for the case r≦R (b) Evaluate the field magnitude B for r=R/5=11.0mm and dE/dt=1.50×10^12 V/ms. (c) Derive an expression for the induced magnetic field for the case r≧R. (15%) 3.Fig.3 shows the cross section of a long conducting cylinderwith inner radius a=4.0cm and outer radius b=6.0cm. The cylinder carries a current out of the page, and the magnitude of the current density in the cross section is given by J=cr^2, with c=3.0×10^6 A/m^4 and r in meters. What is the magnetic field B at a point that is 5.0cm from the central axis of the cylinder? (10%) 4.A retangular coil of N turns and of length a and width b is rotated at frequ- ency f in a uniform magnetic field B, as shown in Fig.4. The coil is connect- ed to co-rotating cylinders, against which metal brushes slide to make conta- ct. (a) Show that the emf induced in the coil is given (as a function of time t) by ε=2πfNabBsin(2πft)=εosin(2πft) (b) What value of Nab gives an emf with εo=150V when tje loop is rotated at 60.0rev/s in a uniform magnetic field of 0.500T? (15%) 5.Fig.5, a real inverted image I of an object O is formed by a certain lens ( not shown) ; the object-image seperation is d=40.0cm, measured along the cen- tral axis of the lens. The image is just half the size of the object. (a) Wh- at kind of lens must be used to produce this image? (b) How far from the obj- ect must the lens be placed? (c) What is the focal length of the lens? (15%) 6.What is the distance on screen C in Fig.6 between adjacent maxima near the center of the interference pattern? The wave length λ of the light is 550nm , the slite seperation d is 0.10mm, and the slit-screen seperation D is 60cm . Assume that θ in Fig.6 is small enough to permit use of the approximatio- ns sinθ≒tanθ≒θ, in which θ is expressed in radian measur. (10%) 7.Sunlight just outside Earth's atomsphere has an intensity of 1.40kW/m^2. Cal- culate Em and Bm for sunlight there, assuming it to be a plane wave. (10%) 8.A long, rigid conductor, lying along x axis, carries a current of 5.0A in the negative x direction. A magnetic field B is present, given by B=3.0i+8.0x^2j, with x in meter and B in militesla. find the force on the 2.0m segment of the conductor that lies between x=1.0m and 3.0m. (15%) -- 推 :靠邀圖勒 218.160.78.138 6/25 畫不出來嘛..╮(﹋﹏﹌)╭.. -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 218.160.29.100 ※ 編輯: michaelhsieh 來自: 218.160.29.100 (06/25 09:35) -- 複雜人生簡單過 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.112.240.75

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s751011502

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justdoit0324

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mike1235

06/26 02:57, , 3^F

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