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磁通量是电磁感应中最核心的物理量,电磁感应现象是否发生、感应电流的方向、感应电动势的大小都与磁通量有关.一、准确理解磁通量1.物理意义:表示穿过某一面积的磁感线条数.2.定义式:Φ=BS_⊥或Φ=SB_⊥,即磁感应强度乘以面积在垂直于磁场方向上的投影,或面积乘以磁感应强度在垂直于面积方向上的分量.3.磁通量的正负:磁通量是双向标量,有正负之
Magnetic flux is the core of electromagnetic induction in the physical quantity, the phenomenon of electromagnetic induction occurs, the direction of the induced current, the size of the induced electromotive force and the magnetic flux. First, accurate understanding of the magnetic flux 1. Physical meaning: that through a certain area of the magnetic lines The definition of: Φ = BS_⊥ or Φ = SB_⊥, that is, the magnetic flux density multiplied by the area in the direction perpendicular to the magnetic field projection or area multiplied by the magnetic flux density in the direction perpendicular to the direction of the component .3 magnetic flux The positive and negative: magnetic flux is bidirectional scalar, positive and negative