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“电磁感应”是高考的热点问题,“线圈”是电磁感应考题中常见的“模型”之一,此类问题如何思考?结合实例,本文就该问题进行探讨,望能有助于教学实践.一、题型例析1.在外力拉动下线框匀速穿越有界磁场区域图1例1如图1所示,光滑水平面上有一垂直于水平面的两个磁感应强度相同、方向相反的临近匀强磁场区,现用水平力F作用在单匝正方形导线框上,使其沿光滑绝缘水平面向右做匀速直线运动,已知每个磁场区的宽度和导体框的边长均为L,若线框进入左边磁场区的过程中拉力F做功的是()W.
“Electromagnetic induction ” is a hot issue in college entrance examination “Coil ” is one of the common “model ” in the electromagnetic induction test questions, how to think about such issues? Help teaching practice .An example of the problem 1. Under the external force to pull the wire frame uniform velocity across the bounding magnetic field area Figure 1 Example 1 As shown in Figure 1, the smooth horizontal plane has a perpendicular to the horizontal plane of the two magnetic induction intensity is the same, Adjacent to the direction of uniform magnetic field near the level of the current horizontal force F role in the single-turn square wire frame, make it along the smooth insulation level to the right to do a uniform linear motion, known to each magnetic field width and the length of the conductor box Are L, if the wire frame into the left magnetic field zone in the process of pulling force F () W.