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在电磁感应现象中有许多相似的物理情景,它们往往遵从不同的物理规律,有不同的解题方法.若不仔细辨析,很容易导致错误,具体说明如下.一、两种常见模型,需仔细区分例1如图1、图2所示.MNQP是平行光滑金属导轨,宽度为L,与水平地面成θ角放置,其电阻不计.匀强磁场B与导轨平面垂直.长为L的金属杆ab与导轨垂直放置且接触良
There are many similar physical scenes in the electromagnetic induction phenomenon. They often follow different laws of physics and have different methods for solving problems. Without careful analysis, it is easy to cause mistakes. The specific description is as follows. One or two common models need to be carefully Example 1 is shown in Fig. 1 and Fig. 2. The MNQP is a parallel smooth metal rail with a width of L. It is placed at an angle of θ from the horizontal ground. The resistance is not counted. The uniform magnetic field B is perpendicular to the rail plane. The length L is a metal rod. Ab is placed perpendicular to the guide rail and contacts well