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2008江苏高考物理试卷第14题:在场强为 B 的水平匀强磁场中,一质量为 m、带正电q的小球在 O 点静止释放,小球的运动曲线如图1所示.已知此曲线在最低点的曲率半径为该点到 x 轴距离的2倍,重力加速度为 g.求:
2008 Jiangsu Physical Education Examination Paper Question 14: In the field of uniform magnetic field with a strong field strength of B, a ball with a mass of m and positive charge q is statically released at point O. The motion curve of the ball is shown in Figure 1. It is known that the radius of curvature of the curve at the lowest point is 2 times the distance from the point to the x-axis, and the acceleration of gravity is g.