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物理問題求詳解-----2小題!!!之三
Mar 24th 2014, 02:47

1.在磁北與真北相同之處,有一向東之水平均勻磁場B恰與地磁分量Be垂直,如有
  一可在水平面上自由轉動之磁針置於此磁場B中,且其N極指向北偏東30度,則
  B:Be為多少?
  (A)根號3   (B)1/2   (C)根號3/3   (D)根號3/2

2.兩粒子的電荷相等,但質量相差一倍,較輕的粒子動能為1000電子伏特,另一粒
  子動能為80電子伏特.今兩粒子分別在相同的均勻磁場中作圓周運動,較輕粒子
  的軌道半徑與較重粒子的軌道半徑之比值約為多少?
  (A)2.5   (B)3.5  (C)5.0   (D)6.3

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