098磁通量及产生电磁感应的条件 精讲精练-2022届高三物理一轮复习疑难突破微专题
098磁通量及产生电磁感应的条件一.必备知识1.磁通量(1)定义:匀强磁场中,磁感应强度B与垂直磁场方向的面积S的乘积叫作穿过这个面积的磁通量,简称磁通。我们可以用穿过这一面积的磁感线条数的多少来形象地理解。(2)公式:Φ=BS。(3)公式的适用条件:①匀强磁场;②S是垂直磁场方向的有效面积。(4)单位:韦伯(Wb),1Wb=1T·m2。(5)标量性:磁通量是标量,但有正负之分。磁通量的正负是这样规定的:任何一个平面都有正、反两面,若规定磁感线从正面穿出时磁通量为正,则磁感线从反面穿出时磁通量为负。(6)物理意义:相当于穿过某一面积的磁感线的条数.如图所示,矩形abcd、abb′a′、a′b′...
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