※ [本文转录自 NTU-Exam 看板] 作者: Bolvalf (改变不了的夙愿) 看板: NTU-Exam 标题: [试题] 94下林敏聪普通物理期中试题 时间: Fri Apr 14 18:42:44 2006 课程名称︰普通物理 课程性质︰必修 课程教师︰林敏聪 开课系所︰物理系 考试时间︰95年4月13日 试题 : 1.Please write down the (four)Maxwell's equations(6%)and give a brief interpretation for each one. 2.Please derive the number density n of charge carriers with charge e in conducting strip of thickness l carrying a current I placed in magnetic field B,creating a potential difference V across the strip(Hall effect).(15%) 3.Please give an "intuitive" explanation for the formation of the energy band in the electronic structure of the solid state. 4.Please describe and explain the three different conduction behavior in conductor, insulator,semiconductor by using the concept of the energy band.(9%) How is the temperature dependence of the creativity for each type?(6%)Why?(5%) 5.Please prove that the displacement current id between two parallel plates of a capacitor can be written as C(dV/dt),where V is the potential difference between the plates, and C is the capacitance.(10%) 6.An uniform sphere with mass M, charge Q and radius R is spinning around its symmetry axis with angular velocity ω. Please find the relation between its angular momentum and magnetic moment.(10%) 7. i)Please explain why dipole can only be stable at some space point with zero field gradient.(10%) ii)Use Gauss law to argue that no extremes of field can exist at free space.(10%) iii)Try to explain why dipole can not be stabilized at free space by field(Ernshaw's theorem)(5%) 8.Good luck!!!!(Total 100%) --

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