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研究所、轉學考(插大)◆電磁學
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91年 - 91 淡江大學 轉學考 電磁學#56129
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題組內容
3. A “pure” dipolep is situated at the origin, pointing in the z direction.
(c) How much work does it take to move Q from (a, 0，0) to (0，0, a)? (6%)
其他申論題
(b) Find the potential at the center, using infinity as the reference point. (10%)
#213230
(c) Now the outer surface is touched to a grounding wire. How do you answers to (a) and (b) change? (9%)
#213231
(a) What is the force on a point charge Q at (a, 0, 0) (Cartesian coordinates)? (6%)
#213232
(b) What is the force on Q at (0, 0, a)? (6%)
#213233
(a) Find the magnetic field a distance z above the center of the loop. (10%)
#213235
(b) Find the magnetic moment of the loop. (5%)
#213236
(a) Find the magnetic Field of the solenoid. (5%)
#213237
(b) Find the self-inductance per unit length of the solenoid. (5%)
#213238
(c) Find the energy stored in a section of length 1 of the solenoid. (5%)
#213239
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%)
#213240
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