087磁场及磁场的叠加 精讲精练-2022届高三物理一轮复习疑难突破微专题
087磁场及磁场的叠加.一.必备知识1.磁场(1)基本特性:磁场对处于其中的磁体、通电导体和运动电荷有力的作用。(2)方向:小磁针静止时N极所指的方向或小磁针N极的受力方向。2.磁感应强度(1)物理意义:描述磁场的强弱和方向。(2)大小:B=(通电导线垂直于磁场)。在物理学中,把很短一段通电导线中的电流I与导线长度l的乘积Il叫作电流元。(3)单位:特斯拉,符号是T。(4)方向:小磁针静止时N极所指的方向(即磁场方向就是B的方向)。(5)B是矢量,合成时遵循平行四边形定则。3.磁感线及其特点(1)磁感线:为了形象地描述磁场,在磁场中画出一些有方向的曲线,使曲线上每一点的切线方向都跟这点磁场的方...
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