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电场中的带电体由静止释放时,由于电场力方向不同,在绳束缚下可能做两种运动:圆周运动、先匀加速直线运动再圆周运动,分清楚这两种运动模型和对应的条件,可以避免由此引发错误.1圆周运动例1如图所示,在一个平行板电容器所形成的水平方向的匀强电场中,用细线在固定点悬挂一个质量为M的小球,小球带负电,小球的重力为小球所受电场力的3~(1/2)倍,现将小
When the electrified body in the electric field is released from a static state, due to the different direction of the electric field force, two types of motions may be performed under the rope constraint: circular motion, firstly uniform acceleration linear motion and then circular motion, clearly distinguishing these two motion models and corresponding conditions, It is possible to avoid errors caused by this. 1 Circular motion Example 1 In the horizontal uniform electric field formed by a parallel plate capacitor, a small ball of mass M is suspended at a fixed point with a thin line as shown in the figure. With negative charge, the gravity of the ball is 3~(1/2) times that of the electric field of the ball, and it will be small.