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对某些比较独特、新颖的物理问题,若能灵活地进行转化,能化难为易.例1 如图1所示,当滑动变阻器滑片 P 置于某一位
For some of the more unique and novel physics problems, if it can be transformed flexibly, it will be difficult to make things easier. Example 1 As shown in Figure 1, when the sliding varistor slide P is placed in a certain position