課程名稱︰普通物理學甲下 課程性質︰大一必修 課程教師︰李慶德 開課學院：電資學院 開課系所︰電機工程學系 考試日期（年月日）︰2015/5/28 考試時限（分鐘）：30分鐘 試題 : =============================================================================== General Physics Quiz -- May 28, 2015 1. A circular loop of wire having a radius of 10 cm carries a current of 0.25A. → A vector of unit length and parallel to the dipole moment μ of the loop is → → given by 0.60 i - 0.80 j .(This unit vector gives the orientation of the magnetic dipole moment vector.) If the loop is located in a uniform magnetic → → → field given by B = (0.25 T) i + (0.30 T) k . (a) find the torque on the loop(in unit vector notation); (b) find the orientation energy of the loop. 2. Fig. 1 shows two circular segments. The lower segment carries a current of i1 = 0.40 A and includes a semicircular arc with radius 5.0 cm, angle 180°, and center point P. The upper segment carries current i2 = 2 i1, and includes a circular arc of radius 4.0 cm, angle 120°, and the same center point P. → (a) What are the magnitude and direction of the net magnetic field B at P for the indicated current directions? → (b) What are the magnitude and direction of the net magnetic field B at P if i1 is reversed? Fig. 1: http://imgur.com/KPXtseL ================================== 試題完 =================================== --

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