等效法是从事物间的等同效果出发来研究问题的科学思维方法,也是分析和解决物理问题的有效途径。运用等效法,可以在得证结果相同的前提下,把实际的、杂的物理现象、物理过程或物理问题,转化为理想的、简单的、等效的物理现象、物理过程或物理问题来研究处理,以达到化难为易、化繁为简的目的。本文拟举例谈谈等效法在研究、解决电磁感应问题中的应用。一、将环形电流等效视为小磁针例题1.用弯曲导线把一块铜片和一块锌片相连接,装在一块绝缘浮标上,然后浸在盛有稀硫酸的溶液中,如图1所示。若把此装置放在赤道上某地,开始导线环平面与磁感线垂直,锌片在西,铜片在东。试分析 Equivalence method is a scientific way of thinking that starts from the equivalent effect between objects to study problems, and it is also an effective way to analyze and solve physical problems. By using the equivalent method, you can translate actual, mixed physical phenomena, physical processes, or physical problems into ideal, simple, equivalent physical phenomena, physical processes, or physical problems with the same result. Treatment to achieve the goal of making things difficult and complicated. This article intends to discuss the application of the equivalent method in researching and solving electromagnetic induction problems. First, consider the ring current equivalent as a small magnetic needle Example 1. Connect a piece of copper piece to a piece of zinc piece with a bent wire, place it on an insulating buoy, and then immerse it in a solution containing dilute sulfuric acid, as shown in Figure 1. Show. If this device is placed on a place on the equator, the plane of the wire loop is perpendicular to the line of magnetic induction, with the zinc plate in the west and the copper plate in the east. Trial analysis