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研究所、轉學考(插大)◆電磁學
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90年 - 90 淡江大學 轉學考 電磁學#56130
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題組內容
1. A thin insulating rod of length L lies along jc axis and carries a uniformly distributed charge +Q.
(a) Find the electric field at a point p along its axis at a distance d from one end as shown in Fig. 1. (15 %)
其他申論題
(a) Find the magnetic Field of the solenoid. (5%)
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(b) Find the self-inductance per unit length of the solenoid. (5%)
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(c) Find the energy stored in a section of length 1 of the solenoid. (5%)
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6. At the interface between one linear magnetic material and another magnetic field lines bend (see Fig. 3). Show that tanθ2 / tanθ1 = μ2/μ1 assuming there is no free current at the boundary. (12%)
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(b) At large distances from the rod (that is, where d>>L)， what is the field of the rod? Give some discussion on your results. (5%)
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(a) Find the potential at a distance z above the center of the charge distributions. (15%)
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(b) Use the result from (a) to find the electric field at p. (10%)
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(a) Find the flux of B through the loop. (15 %)
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(b) If someone now pulls the loop directly away from the wire, at speed v，what electromotive force is generated? In what direction does the current flow? (12 %)
#213246
(c) What if the loop is pulled to the right at speed v，instead of away? (Give the reasons for your answer.) (3 %)
#213247
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