如题图9-9所示,长[tex=4.214x1.286]p4qpXfxX1z1llvSbtm+GLg==[/tex]的细直棒AB上,均匀地分布着线密度[tex=10.071x1.286]8PD0mIS3R8ckP7jv0d0Mil3c7goaog5Phjh372bDxXUab5BrX4AIAEUAKAE1COoVzs4CWrLxV2Ye30N1pLwVEQ==[/tex]的正电荷,试求:(1)在细棒的延长线上,距棒近端[tex=4.857x1.286]qvGEf16RVeLAwYpcR9+ziHr4Mk5owiMYINx3hecmKZ0=[/tex]处P点的场强;(2)在细线的垂直平分线上与细棒相距[tex=4.857x1.286]MT7bgZQrHSaPq/i1t0FAV+GWla+AjqXmhoyZJvA/1eQ=[/tex]的Q点处的场强;(3)在细棒的一侧,与棒垂直距离为[tex=4.857x1.286]MT7bgZQrHSaPq/i1t0FAV+GWla+AjqXmhoyZJvA/1eQ=[/tex],垂足距棒一端为[tex=4.857x1.286]81sSKXnypG5WOCLVAIY9/oK27KpQOgguoum9xYjl4xQ=[/tex]的S点处的场强。[img=156x285]17f57db9ab93c3e.png[/img]
举一反三
- 均匀带电细棒,棒长 [tex=3.643x1.0]Y+78zyccZQE1ktWQr9yhWQ==[/tex],电荷线密度为 [tex=7.429x1.357]U/wtMqNcP8ZAsEcWuWFs5DWLaz+2YfTPgAXEmdRJZVY=[/tex],求:[tex=1.286x1.357]VAHhaW1te0xvoqDVN54/dg==[/tex] 棒的延长线上与棒的近端 [tex=3.5x1.214]U/yHZEyUUZ5c0IhWhJdrGA==[/tex] 处的场强;[tex=1.286x1.357]BEB68bP4vOVk/XYYizw11w==[/tex] 棒的垂直平分在线与棒的中点相距 [tex=3.5x1.214]/YGDvGOoZgAhEou0po3oEg==[/tex] 处的场强。
- set1 = {x for x in range(10)} print(set1) 以上代码的运行结果为? A: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} B: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10} C: {1, 2, 3, 4, 5, 6, 7, 8, 9} D: {1, 2, 3, 4, 5, 6, 7, 8, 9,10}
- 以下程序段实现的输出是()。for(i=0;i<;=9;i++)s[i]=i;for(i=9;i>;=0;i--)printf("%2d",s[i]);[/i][/i] A: 9 7 5 3 1 B: 1 3 5 7 9 C: 9 8 7 6 5 4 3 2 1 0 D: 0 1 2 3 4 5 6 7 8 9
- >>>x= [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9]>>>print(x.sort()) 语句运行结果正确的是( )。 A: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] B: [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9] C: [10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0] D: ['2', '4', '0', '6', '10', '7', '8', '3', '9', '1', '5']
- 【单选题】Which of the following matrices does not have the same determinant of matrix B: [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -1, 0, -9,-5] A. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 0; -1, 0, -9, -5] B. [1, 3, 0, 2; -2, -5, 7, 4; 1, 0, 9, 5; -1, 0, -9, -5] C. [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -3, -5, -2, -1] D. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 1; -1, 0, -9, -5]