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在力学、电学和热学试题中,我们常常都会看到弹簧的身影.由于弹簧的介入,使得问题的综合性增强,难度也相应地变大,因此同学们在求解此类问题时要掌握一定的解题技巧,这样不仅可以降低解题的难度,而且可快速简捷地获解.例1在光滑绝缘的水平面上,固定一个绝缘小球A,用轻质弹簧把A和另一绝缘小球B相连.设法使A、B带上等量同种电荷,平衡时弹簧的伸长量为x1;现设法使A、B的带电量都减为
In the mechanical, electrical and thermal test questions, we often see the figure of the spring.As a result of the intervention of the spring, making the comprehensiveness of the problem, the difficulty is also correspondingly larger, so students in solving such problems to master a certain amount of Problem-solving skills, so that not only can reduce the difficulty of solving problems, but also can be quickly and easily obtain Example 1 in a smooth and insulating horizontal surface, a fixed insulating pellets A, lightweight spring A and another insulating pellets B Try to make A, B with the same amount of the same charge, the spring balance when the elongation of x1; is trying to make A, B of the charge are reduced to