在解决电磁感应现象问题时,为提高解题速度和寻找简捷思路,不妨尝试一下“等效法”和“感动规律”的运用.等效法也可称为模型法,是物理学习中的一种基本思想方法.在电磁感应现象中.通电螺线管常可看做条形磁铁.这是因为二者的磁场极为相似.同样,通电圆环或单匝方形线圈也可看做是一个有 NS 极的小条形磁铁,为此.在解决由于闭合电路磁通量变化而产生感生 When solving the problem of electromagnetic induction, in order to improve the speed of problem solving and to find simple ideas, we might as well try the application of “equal method” and “touching law.” Equivalent method can also be called model method, which is a basic part of physics learning. In the electromagnetic induction phenomenon, the energized solenoid can often be regarded as a bar magnet. This is because the magnetic fields of the two are very similar. Similarly, an energized ring or a single-turn square coil can also be considered as a NS pole. The small strips of magnets, for this purpose, solve the problems caused by the change of magnetic flux due to the closed circuit.