[試題] 98下 吳俊輝 普通物理學甲下 期中考(2)
課程名稱︰普通物理學甲下
課程性質︰系上必修
課程教師︰吳俊輝
開課學院：電機資訊學院
開課系所︰資訊工程學系
考試日期（年月日）︰2010/04/23
考試時限（分鐘）：110 min
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
1.
A circular loop of wire that has a mass m and a constant current I
is in a region with a uniform magnetic field B.
It is initially in equilibrium and its magnetic moment is aligned
with the magnetic field.
The loop is given a small angular displacement θ0 about an axis
through its center and perpendicular to the magnetic field and then released.
Assume that the only torque exerted on the loop is due to the magnetic
field and that there are no other forces acting on the loop. (60%)
(a) What is the period of the subsequent motion?
(b) 畫出一個週期間，磁位能隨時間的變化圖，並標示出它的極值。
2.
請仔細說明磁學中的 Gauss's Law 。 (20%)
3.
大多數的磁性物質屬於反磁性。請以合理的物理說明這些物質的反磁性原理
（請繪圖輔助你的說明）。 (20%)
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04/23 23:47, , 1F
04/23 23:47, 1F