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合肥工業大學大學物理考試試題-資料下載頁

2026-05-29 17:47本頁面

　　

【正文】 harge distribution (r R), show that (a) the charge contained in the cocenter sphere of radius r is , (b) Find the magnitude of electric field E(r) within the charge (r R). (c) Find the maximum field Emax=E(r*) and the value of r*. 19. In some region of space, the electric potential is the following function of x,y and z: , where the potential is measured in volts and the distance in meter . Find the electric field at the point x=2m, y=2m . (express your answer in vector form) OqR1R2 20. The Fig. shows a cross section of an isolated spherical metal shell of inner radius R1 and outer radius R2. A point charge q is located at a distance from the center of the shell. If the shell is electrically neutral, (a) what are the induced charges (Qin, Qout) on both surfaces of the shell? (b) Find the electric potential V(0) at the center O assume V(∞)=0.dAB21. Two large metal plates of equal area S are parallel and closed to each other with charges QA , QB respectively. Ignore the fringing effects, find (a) the surface charge density on each side of both plates, (b) the electric field at p1, p2 . (c) the electric potential difference between the two plates(d is the distance between palte A and B) 7

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