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1 正确理解楞次定律楞次定律的内容是:感应电流的磁场总是阻碍引起感应电流的原磁通量的变化。其核心是“阻碍”两字。(1)阻碍原磁通量的变化:增异减同例 1 在水面上有一固定的U形金属框架,框架上置一金属杆ab,如图 1所示。纸面即水平面,在垂直于纸面方向上有一匀强磁强,则A.
1 Correctly understand the law of Lenz’s law: The magnetic field that induces an electric current always blocks the change of the original magnetic flux that causes the induced current. Its core is the word “impede”. (1) Obstructing the change of the original magnetic flux: increase the difference and decrease the same example 1 There is a fixed U-shaped metal frame on the water surface, and a metal rod ab is set on the frame, as shown in FIG. 1 . The paper surface is the horizontal surface, and there is a uniform magnetic intensity in the direction perpendicular to the paper surface. A.