题目

著名物理学家费曼曾设计过这样一个实验装置:一块绝缘圆板可绕其中心的光滑轴自由转动.在圆板中部有一个线圈,圆板四周固定一圈带负电的金属小球(如图).当线圈接通电源后,将有图示方向的电流流过.根据你所学,判断接通电源瞬间,圆板将                                                                                      (选填:不动、沿I向转动、沿I反向转动),且通电线圈有                                                                                               趋势(选填:向内收缩、向外膨胀).                                                                                                                                                                                                                                    答案:沿I向转动,向内收缩
物理 试题推荐
最近更新