Why couldn't a changing electric flux result in an induced magnetic field?

为什么我们不能改变导致感应磁场的电通量？

In order to make this equation work for all possible electromagnetic scenarios, Maxwell needed to consider a situation where a magnetic field is induced, but not from the flow of current.

为了使这个方程适用于所有可能的电磁场景，麦克斯韦需要考虑一个感应磁场的情况，而不是电流的流动。

He set up a current flowing through a coil of wire so that it would generate a magnetic field, and then he watched to see if that magnetic field induced a current in a second coil of wire.

他设置了一个流过线圈的电流，使其产生磁场，然后他观察该磁场是否在第二个线圈中感应出电流。