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1.Φ、△Φ、△Φ/△t 磁通量Φ=BS,表示穿过某一平面的磁感线条数. 磁通量变化量 △Φ=Φ2-Φ1,决定感应电动势ε的方向,△Φ≠0是产生感应电动势ε的必要条件. 磁通量变化率△Φ/△t表示磁通量变化的快慢程度,它决定感应电动势ε的大小,.瞬时磁通量变化率与瞬时感应电动势对应,平均磁通量变化率与平均感应电动势对应。
1.Φ, △Φ, △Φ/Δt Magnetic flux Φ=BS, indicating the number of magnetic lines passing through a certain plane. Magnetic flux variation ΔΦ=Φ2-Φ1 determines the direction of the induced electromotive force ε, △Φ≠0 It is a necessary condition for generating the induced electromotive force ε. The rate of change of magnetic flux ΔΦ/Δt represents the speed of magnetic flux change, which determines the magnitude of the induced electromotive force ε. The instantaneous magnetic flux rate of change corresponds to the instantaneous induced electromotive force, and the average magnetic flux rate of change and average induction EMF corresponds.