[問題] 電磁學疑問
圖連結 http://ppt.cc/5I!_
圖(A),有一顆球質量 m,以速度 v向彈簧(彈力係數 k)飛去,
如果地面光滑無摩擦力,球僅受彈簧力作用,球就會做簡諧運動,
最大振幅等於 v*(m/k)^0.5,
如果地面有摩擦力,球受兩種力(彈簧力+摩擦力)作用,球不會做簡諧運動,
最大振幅小於 v*(m/k)^0.5,
圖(B),球一樣質量 m,但有帶電量 q,以速度 v向彈簧(彈力係數 k)飛去,
按照電磁學理論,帶電粒子做加速度運動,會輻射電磁波,有能量損失,
球有能量損失,球不會做簡諧運動,最大振幅小於 v*(m/k)^0.5,
可是,球除了受到彈簧力作用外,還有受到其他力作用嗎?
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