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如图1所示是三个感应电流电路,三电路中“电源”均为受有恒定外力(图示电路中的“电源”所受恒定力为重力)的金属杆在匀强磁场中做切割运动产生动生电动势,这样的“电源”与电阻器或电容器或电感线圈构成电路,甲图是纯电阻电路,乙图是纯电容电路,而丙图则是纯电感电路.初始状态相同的三个电路,在不同的电路条件下,其暂态过程及稳定态迥异,体现出物理现象之丰富、物理规律之神奇.
As shown in Fig.1, there are three induced current circuits. In the three circuits, the “power supply” is a metal rod that is subject to a constant external force (the “power supply” in the illustrated circuit is subject to a constant force of gravity). The cutting motion in the magnetic field produces a dynamic electromotive force, such a “power supply” and resistors or capacitors or inductors constitute the circuit, a picture is a pure resistance circuit, B picture is a pure capacitance circuit, and C picture is a pure inductance circuit The three circuits with the same initial state, under different circuit conditions, have different transient processes and stable states, reflecting the richness of physical phenomena and the magic of physical laws.