这里以图1为例,对自感现象演示实验中较普遍存在的两种误解谈谈自己的看法。一,有些同学以为线圈中电流的变化率是由电键断开的速度决定的。这是一种误解,其实,断开电键,仅为线圈电流的变化提供了条件,它并不决定线圈电流变化率的大小。线圈电流变化率的大小,是完全由电路元件的参数决定的。下面定量地说明这一点。 Take Figure 1 as an example here to talk about the two common misconceptions in the self-inductance demonstration experiment. First, some students think that the rate of change of the current in the coil is determined by the speed at which the key is disconnected. This is a misunderstanding. In fact, disconnecting the keys only provides the conditions for changes in the coil current. It does not determine the rate of change of the coil current. The rate of change of the coil current is determined entirely by the parameters of the circuit element. This is illustrated quantitatively below.