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模型的构建就是要把研究的物理对象、条件或物理过程通过抽象化、理想化,形成物理模型。在习题教学中往往会遇到一些残缺的模型,解决此类问题的关键在于巧用完整模型。1比较法例1如图1(1)所示,MN为水平放置的金属板,将其一端接地,Q为一正电荷。当静电平衡后,电场线分布如图所示。如果Q与MN之间的距离为d,那么为使点电荷Q能维持平衡,应对它施加多大的外力?
The construction of the model is to abstract and idealize the physical objects, conditions or physical processes under study to form a physical model. In the exercises teaching often encounter some incomplete model, the key to solve such problems lies in using the complete model. 1 Comparative Law 1 As shown in Figure 1 (1), MN is a metal plate placed horizontally with one end grounded and Q a positive charge. When electrostatic equilibrium, the distribution of electric field lines as shown. If the distance between Q and MN is d, how much external force should be applied to keep the point charge Q balanced?